Contract cancellation declined by Telkom, continue billing after cancellation

I have contract Telkom SA to cancel my contract on the 1st March and again on the 5th March at (17:25 call duration 15 minutes) since my contract was ending month end March 2024. to my surprise Telkom decided to bill me again in April after the contract was cancelled, however after contacting Telkom Cancellation department to inquire i was told by the urgent that there's no evidence that the contract was cancelled on their side. i have requested Telkom to listen to the recording of my call on the 1st of March and 5th March to confirm if i did not cancel the contract. two days later on the 9th of April i reveiced an sms saying your case is resolved then i called Telkom to confirm if it was indeed resolved as per sms i received. unfortunately i was told my contract is still active they will continue investigating the case. while awaiting their investigation i received an invoice for May that i must pay for a contract cancelled in March. i have contacted Telkom again to find out what was happening, they asked for the ref number which i provided for further investigation. on the 8th May i received another sms advising me that my contract has successfully been cancelled and due to accounts being paid in arrears all recently implemented changes on account will only be updated onto the next month bill/invoice/statement. mind you the said account is up to date since they debited me month end April. when i call again today to find out the meaning on the sms, i was told the contract was cancelled yesterday (9th May 2024) the reason for the cancellation is not known since they were supposed to listen to the recording and confirm if i did not cancel the contract in March as per my request. cancellation still cannot listen to the recording after two months of requesting the same thing. Telkom decided to cancel my contract yesterday instead on investigating my request, inaddition they still expect me to pay the invoice for May after two months of cancelling the contract. cancellation department transferred me to Billing department for refund for April, i asked if they are not suppose to send communication to Billing department for such request and i was told i must do it myself they will assist me. Billing department told me they need a reference as evidence that i did call to cancel the contract and that should be sent by cancellation department. Billing department had to log in another case after confirming that they can see from their side that I did call on the 1st of March and request cancellation of my contract. Telkom is sending me from pillar to post just to resolve my case after a good 3 months unfortunately i cannot cancel the contract myself someone has to do their job from Telkom, if there's no evidence that the contract was cancelled or i called to cancel the contract. why can't they go listen to the recording as per my request after providing them with the date and time of my call. kindly assist