Receipt from Microsoft on things I havn't bought

Hi! I have a particular strange problem, for a few years time now I have received emails about purchases, mainly game related. It is ofcourse not my own purchases, the 4 last digits on the credit card number is not mine. So, there is no scam. I guess someone have added my email by mistake. I have contacted Microsoft support but they couldn't help me., so currently Microsoft is spamming me How should I go about it?

:)