Poor service from Cell C

I have been a Cell C customer for about 5 years. First on contract and now on pre paid. Now all my background data is switched off and all apps are only open if I use Wi-fi. Every time my data expires all my airtime also disappeares. I phone the call center and every time they will "investigate" the last call I made on Friday 15 June 2018 the agent told me that they will only start with a new investigation in July as they need to do updates. I feel that they are *****ing from us as customers and they can't even get back in touch with the customer.