iPhone activation lock, What to do!?

I buy phones from online police auctions cheap and sell off for profit for a side job after my full time job to earn extra cash. For the first time I thought I’d try win a phone that is locked and try unlock it to sell. I was told from others that do the same as me that they use apple to unlock their phones they buy from auctions. I win a iPhone 13 Pro and with this phone it was iCloud locked and in lost mode. I decide to call Apple and I ask multiple times if they are able to unlock the phone for me and take the lost mode off, I am told yes! And to and my proof of purchase from the auction with the imei number and any other evidence that might help. I tell him I have the invoice with the description and imei number for the phone has the business name address account number. I also say I have the bank statement for proof of payment and told him I also have the text that I won the police auction and he said that’s all I need and to add to a link he’ll send me to request to unlock the phone. I do all that, and then that following night I call to see how long it may take. The second person tells me if I send the required documents it should take 24 hours. I tell her what I had sent and she says that’s all I need to get help with activation lock and lost mode. After 24 hours I noticed I hadn’t been emailed about anything so I call and ask what is happening with the phone, the third person says she doesn’t understand why I was told it takes 24 hours when it states it takes 7 working days🤦🏾‍♂️ I tell her what’s wrong with the phone and what I had sent to help with my request, she also tells me that Apple can help with what I want done and I just need to wait 7 working days. After 8 working days, the phone is still locked and in lost mode. I call to see what is happening and tell the forth person about the situation, he’s sounded confused straight away and then says that Apple does not help with lost mode. I then ask if I can speak to a supervisor which he was happy to do. I speak to the supervisor which is the fifth Apple employee and I then explain everything from the start and every conversation I had. She apologised and says let’s get started with onlocking the phone for you. I stop her and ask so we can take the activation lock off and lost mode? She says “sorry we can not continue as the phone is in lost mode, if it was only activation lock we can do that for you”. Then says she needs to decline my request. I asked her so if my phone was only activation locked/iCloud locked you can help me!? She said “yes”. Couple days later I call to double check if they couldn’t unlock the phone and the sixth person I spoke to which was another supervisor (2nd supervisor I spoke to) says after I explained everything that it would be best if I just bought a phone from a trusted Apple supplier like Noel leaming. I say I buy them from auctions cheap to resell for profit as a side job for extra cash. She never said yea or no to me about being able to unlock the phone but said my request is declined. Before she declined me she said that the Apple tech people are the only people that can decline a request. But on apples behalf she said she will decline my request which confused me as she clearly told me only tech people can decline a request. I call tonight maybe a week later. To ask if I can get any new phones unlocked if it is only activation locked as a supervisor has already told me yes but I want to make sure I don’t buy the phone for nothing and I get declined again. This supervisor said no, after 30 minutes of talking I realise we are talking about 2 different phones. For 30 minutes I was talking to myself about a new phone I may buy that is locked again on the police online auction. She thought I was talking about the iPhone 13 Pro that was in lost mode, and 2 times I heard her say they cannot do anything about my phone in lost mode when I wasn’t talking about that phone, I asked her to listen clearly and I say multiple times if I buy another phone that is activation locked, can you help me unlock it with the proof of purchase and that I send. She brings up the iPhone 13 Pro and says no they can’t help with lost mode🤦🏾‍♂️ then I tell her I want to complain. She tells me it says on apples site that I need the original receipt of purchase from the store it was bought from, I say it doesn’t say that in the request part to get them unlocked and she says yes so I go and look and it doesn’t, all it says is we need proof of purchase documentation with the imei number. Which I had and will have to do future phones. After talking for more then an hour and a half she couldn’t really tell me anything. She told me they couldn’t help but wasn’t sure and to try my luck. I have friends that’s had it done so might try trough them next time. What should I do?