Frustrating service

Cell C are charging me double for the contract that expired in March. No word or terms we relayed to me about this. I called Cell C on the 26th of July 2018 at 13:40 and spoke to Lungile Thela and asked her about this and she could not explain it. I then asked her to log a request on my data contract linked to my calling line so someone could revert with answers and no one called back. I then called again on the 31st of July 2018 and got through to Mbali Cele who told me the request was logged on my calling line and not my data line. I then asked her to rectify it and demanded to speak to her team leader. She then forwarded my call to Kelvin Choudree who was as useless as the rest of the stuff. I asked Kelvin to send me the contract with the terms and conditions for my data line but he sent the contract for my calling line. This is frustrating to deal with people who have no detail to attention and listen with their mouths and not with their ears. Cell C, please employ people who are competent or ups**** your existing stuff about service. These clowns are letting your business down