Bridge of contract by Telkom as usual

So Telkom tries to debit my account on the 30th which is a Saturday because the 31st was on a Sunday even after the agent who sold me the contract clearly told me that if the debit date falls on a Sunday or Public Holiday they will debit on the next business day. And I also made it clear I need the debit order to run on the 1st of every month as I can guarantee there will be money in the account. So debit order of R189 was returned and I was then instructed on the 3rd to pay via EFT which I did. No Telkom is charging me a whole R202 for a returned debit of R189 which by their systems fault ran before the last day of the month and the amount was paid via EFT before 7 days which according to the act I have to pay an account before any charges or arrears can be added. This is horrible service from Telkom and they refuse to cancel this charge and also refuse to cancel debit orders so I can pay them by EFT going forward. Telkom is a trap.