Incorrect debit and incompetant Managers and Staff

I obtained a new contract in dec 2017. Buhle from cell c Westwood dealt with the contract and messed it up. There was a promotion for R199 for 5 gigs day and 5 gigs night plus extra 5 day and night. I received only 5day and 5 night. Queried it and was offset on my Feb 2018 bill(2 months later) Call the Manager in Jan 2018, Early Feb 2018 and he abruptly told me I will receive my refund/offset end of Feb 2018 from Dec 2017 issue(Pathetic) Now I open my new bill to see that I have been billed R398 instead of R199.00 Called Buhle from the branch and was told it was for calls made and yet when she opened the contract, She set it so that I don't pay anything more than R199.00. This branch is pathetic and the Manager Ryan is useless, He cant do anything, Everytime I called in which is about +- 15-20 times since Dec 2017 He does not help, just says he will get someone to call me. If he is the Manager, Why cant he assist. This branch has so many complaints and yet these staff are still there. Is these platforms whereby complaints are given a joke to them. I have another contract with Cell c which will be over this month and I WILL NEVER..... EVER .......TAKE ANOTHER CONTRACT OUT WITH CELL C. Cell C will lose all their customers at the rate things are going.