Apps dont work through vodacom

I have the deezer app which i subscribe to through vodacom for more than a month now it hasn't worked keeps saying u expected error i have phoned the call centre no less than 5 times some people i get dont even know what the app is so not sure, how you can work for a company and not know what products you offer. I have also emailed and sent screenshots of the problem to vodacom after they requested it and still no feed back just a message to say ticket closed. Ive now had it i want the problem fixed and my premium refunded for last month as i could not access the app i paid to use. The call centre reps say they will call back but never do and I've had it with the lack of service