Poor customer service

In March 2021 I wrote a hellopeter complaint. A consultant called me and advised they have investigated and will correct the error. However I was advised that payment of R369.00 for March needs to be paid ,then only will they be able to cancel my contract. Payment was made and consultant confirmed in April. When I asked for letter of closure as proof . I was advised that i am being billed R65.23 for a Failed Debit Order Penalty Fee (No VAT) 31-Mar-21 along with Out of Bundle Usage for SmartData Internet usage incurred in March 2021 before we cancelled your contact on the 31/03/2021. I didn't not use all the data it expired on the 31st . And they have been debating my account with wrong amounts, after I paid the settlement amount. THEY JUST ***** FROM THERE CUSTOMERS!