Very Dissapointed with Webafrica billing Department

WebAfrica is terrible, we had a line with them until last year September when I moved out from the apartment I was staying, I requested for cancellation, but because the lady that was moving into that apartment wanted to get a contract with them, they asked that we do change of ownership, we filled the form and thought it was over, only realized last week that they never cancelled my line, and they have been billing me the whole time, for a non-used line, so dissapointed. The worst thing you cannot get an actual person to talk to on the phone, they always send you to speak to a robot on WhatsApp, and when they finally get you someone, they cannot help, take long and they send you message that you took long responding, so they close your ticket, and ask you to re-open the new one, and re-explain your case over and over. I am so sick of this and I need my money back from September last year.