Very upset Telkom customer

In March 2024 I paid up the balance left on my Telkom contract. I called in to cancel my contract and I was advised not to cancel the contract but keep it till June so I could still get all the benifits and then I will cancel it beginning of June. We agreed and then came few days before end of March and I was told that I no longer have a contract number on their system. I was only given 1GB of data for April and no other benifits that the contract had. There was a balance that was due to me of R1000+- . A debit order still went off beginning of April despite my account being over paid. Because I would not have any money left for my debit orders I was forced to reverse that debit order because the Telkom account is over paid. Now I call telkom to ask them when will they refund me the balance of R 1000+- they tell me that it's not R1000+- but R300 +-.and there is still an immediate invoice that was issued end of April. So this means from over paying my contract till June thinking I will still get all my benifits every month to ending up , with nothing. May I did not get any data. The money that was over paid is also being taken by telkom for their charges.