Refund for Pokecoins

Here is my chat from apple support: I just got charged 100 pounds for literally not receiving my ingame content. The only solution is provided: contact app developer (which is Niantic) and I already got in touch with them several times. They cannot confirm purchase as they didn't received a bill from Apple.

Both companies solution is to contact the other company. So this cannot be that i get charged 100 pound as a student without getting a proper customer support neither from Nianitc nor from Apple.

Furthermore, they even don't offer to interact directly with each other to solve this solution.

I imagine the real problem is that my account was registered (and my email) with a German ITunes webpage. After i came to GB i changed the country within my iTunes which did reset quite a bit and I had to reinstall some apps as they didn't function anymore. So from ITunes/Nianitc side the developer doesn't seem to think about that.

Here is part of the chat: apple answer is normal, mine is itallic. I added the chat as an additional file as it is appparently to long.

P.S.: Thanks for reading this long post. So people, please, what is your recommendation now?