forwarded my phone calls

People are using my number to forward there calls to this number 1-408-307-5045

This number 1-408-307-5045 forwarded their calls to my cell phone, too. (I looked it up in my cell phone acct history) I never retrieve my messages so I don't know who actually called, nor who they were looking for.

The call number that was forwarded to my number was 18002782420

somehow is getting my calls