Breach of contract

I took a second contract with telkom for Sim only data, it turned out to be my worse nightmare. The contract was that they will start debit after two months, comes the month of Debit don't debit I didn't notice also on my side but I knew I had money on account.

After two received a notification that my account is outstanding. Went to their branch asking about the amount am owing and they said they didn't debit and they just print the statement that am must pay the outstanding of R 879, and the service on the Sim card has been cut as well, ok pay the outstanding via woolworths, I called them the next day their say I have to wait because the amount hasn't reflected on the system I waited for two weeks nothing. I decided to go to their branch again, they told me I paid the wrong account while they printed and highlighted the account am suppose to pay. It took other week for the to fix the issue after I went to their branch again. They launch a dispute and they sent me a case number that may issue is being checked on. After the dispute they opened the service on the Sim mind you i took that contract because I was working from home due to lockdown restrictions, I had to find other fund to buy data.

Comes month end still they don't debit and they shut down the Sim card saying am owing. On the second week of October they call and say I must pay the account I told them I don't have money and is not my fault that they didn't debit because there's always money on my account month end.

On the 16 of October they debit I call them and told them that they are breach our contract that money was not on my account to pay them and I told them I'm reversing the Debit because the contract says they must debit month end. Please assist me because now they referred me to debt collectors.