We build our business website from a web developer. He had the access of domain hosting and everything, that is was the bad idea. After he doing his job we paid him fully. Now we have to make some changes and I called him. He ensure me he'll do everything we needed. We waited 2 weeks and nothing updated, then I called him but he ignore my calls. Right now he ignore everything even don't give any access to my site. What should I do now?