Poor Customer service and incorrect billing

I so disappointed in Telkom,they have not been billing me correctly according to our agreement.I took a contract with them in May 2023 for R299.First billing was for R398 include R299 +R98 for connection which was supposed to be collected end of June 2023,which they collected R299,when I called on the 26/07 to change the debit date and find out why the full amount was not collected I was told there is a credit limit placed on their side for R299 meaning they can’t collect more than R299.I asked to increase to R400 to cater for the R99 in August collection.Then they collected R258 end of July instead of R299,when I called in today 6/08/2023 and spoke to a very rude assistant by the name of Emma,who told me I owe R708,which I don’t know how we got to that amount and without listening she placed me on hold told me she finding out about my R6.she thought I was querying the R6 but query was about the balance because the R708 that I owe means that R258,which was collected was not accounted for.and when I call in place my Telkom number the system says there was no collection received for July.according to my calculations I should be paying R438.I would like this to be resolved because I placed on hold until I dropped my call.This is so pathetic coming from Telkom and Emma needs more training on how to deal with all types of customer,as my concern were not directed to her personally and have not in any way during our interaction made it personal but she took it personal.