Telkom Refund

I have cancelled my Telkom account and a refund of R852.03 was due to me. I have been in contact with Telkom and Simon Madlala with regards to my refund that was processed on 20.02.19 according to Telkom and Simon Madlala. I have still not received my refund and have been in contact with Simon and he has told me that there was an error with the refund and he will be dealing with it. I got my invoice/statement and it seems that Telkom just raised an additional invoice for the full refund amount of R852.03 to make my account NIL. Why does Telkom want to steel from customers?????