Telkom mobile BIG BILLING MISTAKE

I have 2 Telkom cellphone contracts. *** *** CMO DE AL****A ID *** I took out 2 contracts Flexon 2 TOP UP. R139 per month I have been struggling for 4 months now to fix the one contract. Today Telkom deducted R139 and R179. LAST month with ALL my phone calls i was told that someone added R40 xtra minutes…. i do not even use my free 75 minutes a month. I told them to check on Telkom system and they saw that i do not even use my 75 free minutes. I did the upgrade of this contract online and i was told that THAT lady added R40 xtra minutes!!!! I NEVER EVER ASKED FOR THAT. I have repeated 4 times that i want a FLEXON 2 TOP UP. I have repeated myself fews times. Every time in these 4 months that everything is now correct and i will also get a refund for all the mistakes done by Telkom. THIS IS SUCH SUCH BAD SERVICE… I NOW JUST WANT TO CANCELL THIS CONTRACT!!!!