Debiting my account wrongly

Good evening Please help me,i have a contract with Telkom Mobile for Data,im with 13 months now with them,when i took this contract i put it clear that when data is finished it must cut off,and yes its like as i told them,the problem started on July when they debited my account with R599.00 instant of R99.00,i reported to telkom they promised to sort out in 7 to 9 working days,after that they told me that the matter is resolved,off which they didn't reverse my money,next month they continue debit another R599 ,i went to their shop where they told me that i must go to my bank reverse it,and deposit the amount that they supposed to debit,i did that after two days they debite again R865.00,i took the matter to the National consumer commission,after some few weeks they told me that the matter is resolved. But after that email a week later Telkom started where they end,they debited my account again with an amount of R1500.00. I don't know now what must i do. Please Help me to resolved this Regards Mduduzi Mnguni ( ********** )