When I first came here (2013) I knew nothing about...

When I first came here (2013) I knew nothing about the process for filing taxes, it was my first time. Did my taxes here 3 years straight. This last year I tried h&r block and was surprised to find out Atlantic tax services had filed my taxes wrong, they advised me and my girlfriend file jointly which you can't do unless you're legally married but they didn't mention that. They were only trying to GET ME MORE. Now I have to ammend my tax returns and pay back over 3k. Thanks IRBusiness!!