Telkom Mobile contracts

I have been using Telkom mobile almost two years now. In January 2019 I changed my bank to Capitec. At Capitec they informed all my debtors that in February 2019 I will be using Capitec to run their deductions. At Telkom they deducted at Capitec Bank in January and they couldn't find enough funds. But on the 15 February they came back to deduct amount of R601.88 instead of R301.88. I phoned them and they responded by saying they included the amount of February 2019. Okay I didn't have a problem with that because I thought I won't be charged at the end of February. Indeed they didn't charge me but they sent me a bill of more R500 for March 2019. When I asked them about this, they say it is because they couldn't find enough money in January. I asked them to send me their Breach of contract policy, on their policy it is clearly stated that the customer will be given 20 business days to rectify the Breach. Remember I was supposed to pay on the 31 January 2019 but the payment was made on the 15 February 2019.

Now I am concerned about their penalty charges while I paid within 20 business day. I questioned this but they didn't respond. This is a second time complaining about Telkom and they don't resolve the issues.