For the past two months, every time I log in I see that someone has hacked into my account and changed my username and I'm unable to change it back because of the 30 day limit. But beyond this, what is the security issue? I've changed my password multiple times so what is going on? This is really upsetting me.

First it was changed to OfficieYT and now it's iJosephx_

Please fix this for me