After contacting Apple Support thrice, didn't get my Apple ID activated

I opened my iPad 3 after months, As usually, It popped up on my screen to login my apple id, when I did It said "Verification Failed, This apple ID is not active". Immediately I realised that I had logged in some other iPhone's App and iTunes Store with the same apple id weeks ago, without wasting much time, I logged out from there. After trying everything, I contacted apple support for the first time on call, they told me to wait 24 hours to get my apple ID working again. I did that, then I contacted them again, still the same process and waiting mission. I contacted them thrice. The last time I explained my issue was yesterday, at 12:20 pm, currently it's 1:33 pm, past 24 hours wait criteria. I didn't login anywhere in the mean time as they told me not to. She said I should try to reset my password after 24 hours but still I get the same message "This Apple ID is not active."

No, I never received any email to my gmail account which was linked to the apple id regarding the activation whether I am eligible for activation or not. I don't want to contact them again as they will say the same thing again and again.

I don't have the bill, because I bought it in 2015. Only thing that happened after the support is now my iPad is in activation lock 🔒.

I can't put it in words how frustrated I am rn. I just wanna throw it away!

Please help me out! I would really appreciate it if there comes a solution to this.