Terrible VOIP service

I had the VOBI VOIP app from Vox. First I received calls looking for another company. When that subsided, my service stopped working. No service complaint could resolve the issue. My tickets were always closed before it was resolved. Then I started getting calls from people replying to a company's calls. Obviously my number was recycled to another company. When I cancelled my service, I started getting larger invoices than before, despite the service been cancelled.