Hey @stefanneel,
Sorry to hear you've been having so much trouble just getting those coins to show up on your account.
I'm afraid we're unable to assist with this type of account related issue on the forums.
I do see you've already created a few cases, and it looks we're still waiting to hear back about some additional information that was requested in your first case.
That will need to be provided to support before they can continue looking into this for you, so please take a look back through your cases to follow-up with the original request.
You will also need to provide these proof of purchase screenshots in addition to the requested information, so please be sure to have those screenshots handy when reaching back out.
The available contact options will depend on your location and the current time, so if you're not seeing live chat or phone callback options and only receive the email option here but would prefer a different contact method, you can also speak with them over Twitter or Facebook instead.