Zero customer service

I have tried on numerous occasions to cancel my contract. Device is fully paid for but they keep sending me airtime that I can't use and don't want. I have spoken to Jerome as well as Nomhlanhla. Each time there's a different excuse for making me hold on the line for more than 20 minutes without assistance. Can't access the program or having system issues. Really guys??? This is ridiculous. It shouldn't be this difficult, frustrating and time consuming. Never again Telkom.