Receipts sent to me in error

I keep getting receipsts for someone else sent to me at my Apple address.

Firstly, why? Doesn’t Microsoft confirm email addresses before sending receipts?

Secondly, why would Microsoft not send all receipts to the Microsoft address needed to use its services in the first place?

Thirdly, why is it so hard to explain this to a human? The chat system doesn’t cover this problem. Even this forum doesn’t have a heading for the problem.

[Moderator Edit: Moved from Virus and Malware \ Other \ Scanning & Removing threats]

:)