Billing for service I didnt recieve

Ntelecom made me buy a dish for my wifi connection over R2000. I was fine with that. I had a package of R695 pm. for the first year or so all was fine. Then the changed the package to R750 pm without asking me if i'm fine with it. Then i missed a payment and my account was suspended do to lack of funds. I phoned Ntelecom to ask them to cancel my subscription but they said i first have to bring the account up to date to cancel. So now my subscription has been suspended for more than 3 months. More than 3 months i didn't receive any wifi connection what so ever but they kept on billing me. Account is in arrears with oven R3000 and the only way according to them how I can stop them billing me is to pay the account up to date for something i did not receive. Today a man called me and wanted to come and collect the dish I payed cash for over R2000. When I asked him but how can you come and take the dish he rep**** its because my account is in arrears. In arrears for something I did not receive. Very poor from Ntelecom not happy at all. One cannot just take money from anybody without giving something in return and come and demand the dish i paid for.