iphone11was hacked

I have hotmail email. It won’t let me send email or get email. It keeps saying my mailbox is full even after I delete anything I don’t need. Photos email etc. also I’m getting mail in my junk e-mail I don’t recognize. It’s very frustrating. Can someone help. Also I got a message from Microsoft saying unknown user fro m Moscow Russia. I report it but nothing seems to happen. I am also getting messages from October 2023 which I have already deleted HELP