MTN open ticket on cancellation

MTN Cancellation department. I phoned and cancelled my wifi 400gb top up contract on the 26th June 2023. they sent me an sms to this affect, that my contract will be cancelled on 26th July and that i still have to pay for that month, which i did. Today 28 August i got my monthly statement and there they have billed me again for this contract. I went to the MTN shop to try and resolve this matter. They checked on the system for me and said that they can see the cancellation ticket for that but that it is still open, meaning it was not closed to stop the contract. I then phoned MTN and explained this to the lady which she told me that she can see that the ticket is still open and that it was scheduled to be cancelled, on my question for what date it was scheduled to be cancelled she could not answer me. i then asked to speak to her supervisor after which she told me that he was in a meeting and took my details for him to phone me back and said that she is sorry. Everybody says that they are sorry but nobody wants to take some action and do something about this. To me this is totally not acceptable. Nobody phoned me back so i decided to phone back again in the afternoon. After several attempts i eventually got through to a lady, it was not her department but she tried to help me anyway. She gave me a number to dial and then to try and resolve the problem. The problem is that that number is the same as phoning 135, you can only follow prompts on computer and do not get the opportunity to speak to a person that you can talk to. She also gave me a ref number which is 1/ *** but not her name. I went to the MTN shop again this morning because nobody has phoned me up to now and at the shop they only told me to try and follow the complaints procedure, which i have done up to now as far as it would let me, but with no success. What saddens me the most is that i have been a customer of MTN for 23 years now and this is the treatment i get.