Vumatel the worse, refuse to release ISP in my own house

Vumatel cancellation team is the worse, I requested that to release the ISP of the previous owner and the previous owner requested that they release the ISP. The employees there are taking my back and forth, they first requested lawyers letter I sent them, and after requested an affidavit I sent them by their lazy employees are not releasing the ISP now going to three weeks. As I work from work I can do anything because of Vumatel.