Once again (yearly) I am being threatened and ****** in daylight by MTN

I am now at my wits end. I do not know how a company can be established and yet have such an enormous number of *********** staff. April 2023 I cancelled my data contract with MTN (there is a review about it on this platform and how they tried to ***** me over) while cancelling that contract I enquired as to how soon I can cancel my current contract and was informed the earliest is January 2024. I then received an e-mail in October informing me that my monthly fee is now increased (nearly doubled) because my contract has expired. When I called MTN a few days later to cancel the said contract, I was told I cannot do so until my final payment goes off on the 1st on November (feel free to go and listen to the recorded conversations) I obliged. On the 3rd of November I called to cancel the contract and was e-mail confirmation of the cancellation. I was told this is my cancellation month, to which I responded that October was my cancellation month as I was refused the cancellation when I called then. On the 26th of November, I received the following mail from a MTN no reply mail address: ""We've changed your cancellation date for your 2783******* MTN line to 11/26/23. You will be billed accordingly" Now, can a senior, competent person please assist me, and tell me where do you get the ****ing right to change my cancellation date??? Surely this is again the law. I have done everything correctly, if there was any ***** up it was on your side, not mine! On the 7th of December I was informed via sms that my number has now been blocked from making outgoing calls. And that I should pay and amount, bigger than my debit order via the app. Are you be***!! Why would I pay for a contract that is cancelled!!!! Today I received a sms threatening that my credit rating will be impacted if I don't make payment. I request that my number be unblocked from making outgoing calls, and that any billing against me be reversed as I promise I will drag this ****ing company through **** on every social platform if this continues. This is why after nearly 20 ****ing years of being a client....I am ****ing done with you! Your service is the most pathetic....I thought Telkom was bad, but I will do business with them any day over you!!