I’ve had the most success with contacting the sender and telling them to stop sending mail to this address, no mention of the mismatched name. What I don’t kno

I’ve had the most success with contacting the sender and telling them to stop sending mail to this address, no mention of the mismatched name. What I don’t know how to solve is that after successfully unsubscribing from a particular spam mailing I just started receiving apartment n+1’s instead. What am I supposed to do, work my way through the whole building?