Incorrect billing

Telkom please refer to Case number: ********** 9 that was something I posted on hello Peter a few months ago you said it was resolved but now you talking all the money back by billing me last month over R430 for a contract that is R99 and this month over R530 for the same contract. I asked for the credit to be transferred into my account. However it was transferred into my bank account and a credit was placed on my Telkom account. Which caused me not to pay for the last 3 months I queried my bill by calling in as I saw only R12.80 was deducted then I noticed end of November over R400 is going to be deducted when I done further research I realised that you guys messed up yet again. I was OK with paying the money was that was credited on my account as I already received the refund. However the issue is that i just received another bill for over R500. Attached is my invoice. I also emailed the Lady that assisted me with the refund Cleo but she never got back to me. I'm going to cancel my contract as soon as this is sorted. Telkom you might have the cheapest prices but have the worst customer service.