Capitec dissappointment

I have a problem with a debit order that Capitec says they cannot help me with. Telkom is taking money from my account for services that expired in March 2021. I could reverse some amount but they change the amounts and Capitec allows the money to be taken even if the amounts are 5x the debit order amount.I have been in contact with Capitec via email seeing that i am not in the country at the moment . My last two emails went unanswered.I asked them to please stop the debit order to Telkom and reverse the payment. How do i stop this if my bank is unwilling to help me.