Pathetic and poor call center service

I have had numerous issues with Cell c call center and their pathetic services from upgrading my contract to my monthly payment the service from your call center is absolutely poor and ridiculous. On Sunday the 28th of Feb I logged a complaint with my account being debited over R300 more than my current installment the same thing also happened in January but January was R150 More and I was not aware of this extra money. The consultant told me I will get feedback in 48 hours it's been over 1 whole week and not even 1 sms or phonecall regarding this issue. This is absolutely ridiculous and pathetic such a huge cellphone company which lacks simple ethics qualities. I NEED FEEDBACK ASAP AND PLEASE TRAIN YOUR CALL CENTER STAFF