Incorrect Billing and Pathetic Service

I have been frustrated by MTN Cresta' s employee's pathetic service beyond any reasonable explanation. I renewed my contract in May 2018 and every month i have an issue with my billing. I have been deplomatic about this with the person that helped me renew my contract (Winkey Maruwa) but she has been so *********** in helping me. The last time she communicated that there is nothing she can do. MTN has not captured my discounts on the new contract and noone can help? I have called the call centre, no one helps, the person who renewed my contract is so bad with service it makes me sick to ever want to renew my contract with MTN. My billing keeps fluctuating every month with no help in sight. If you are renewing your MTN contract at Cresta, DONT ever use Winkey Maruwa. She will simply make you hate MTN more. I am simply not renewing my contract with them. I have gone to their customer so called innovation centre in 14th avenue only to be told that there is nothing customer service can do, because there is noone from complaints department. I have been ********** by MTN and will not be renewing my contract with them ever again