Billing issues

Honestly Telkom doesn't even deserve 1 star, I missed payment in March, my monthly recurring charge is 498, I expected to be debited 1198 on the following bill however I was debited 946 on 31 March which I thought was for 2 months, then my account was suspended, I then called & they told me it was an error they will fix it, within 24 hours the suspension was lifted. At the end of April they debited my account with 329 which was the incorrect amount, now again my account is suspended, I called them to find out what's happening, the first consultant hung up on me, the second consultant told me it was insufficient fund hence why they debited less which was not the situation I told them I'm willing to send a bank statement but she insisted and was rude as well. I then hung up and went to the store today, the store consultant said it doesn't make sense but I will need to pay R800 this month then log a query, after leaving the store I called again using another number and spoke to the collections department who advised me that I need to wait to be debited the full amount at the end of the month. Why should I be the one suffering because of Telkom faults and errors they do on their end because they debited the incorrect amount, I requested to speak to a manager which I have on the last call as well but the consultant told me a manager will call me back which is what I was advised yesterday as well. I insisted to speak to a manager the consultant did not say why I cant speak to a manager then hung up as well.