Cell c overcharged since December 2017

Once again!!!! I started a contract with cell c in December 2017, i was overcharged by R200 a month, every month its my duty to call and email cell c, its now the 12th and im now tired of the emails i send with an auto responce saying they will get back to me in 2 days, still waiting on a reply since the 28feb!!!!! Come now cell c what do u think of that as customer service!! I do get two stinking msg to say i owe R146 and what account can they debit? I asked cell c 4 months ago to cancel my debit order, last month it still wasnt cancelled, that is what the R146 is for, its the Two R70 for unpaid debit, pls cell c tell me thats my problem i will not pay it!!!!! Reverse the charges immediately!! And correct my bill before the 20th as im not paying cell c messed up of overcharged contract u made!!! When will this be corrected im now tired of month after month phoning to correct your staffs mess up!!!! So angry