Bad client service

Good day I have a big problem with Dstv since August, I am on price lock with them my customer number of dstv is ***3, the is an agent I spoke did confirm that my account is ridiculous overcharged and now in September 25th they took R1011. 13 instead of R551. 50, they only told me that this will take 48hrs to be resolved through out the week I've been getting hold of them with no luck of my account being rectified, I am appalled by multichoice service coz this dented my account with unnecessary deduction amounts now I have to wait for a response that will never be answered since this has been over a week and no answer at all, in disappointed by multichoice, I have even emailed them countless times, please intervene