Bad service from Telkom/Nudebt

The end of March I didn't have enough money for Telkom to debit my account so they handed my account over to Nudebt and block my Telkom account on 15 April I received calls and messages to settle my account which was no double the amount including April's amount on Saturday 26 April I paid the full amount of R3117 via eft. I called them yesterday and today and I was told it will take 7 working days to unblock my account I mean payment is already reflecting on their side but to lazy to update their system and tonight they debited my account causing an unpaid debit on my account while the bank is charging me for unpaid debit orders and it's the 3rd unpaid debit on my account for this month from them. I'm very unhappy with Telkom having my contracts with them for over 4 years and I just missed one payment and this is the service that I get from them I'm very disappointed and annoyed this is bad service