Bad marriage I cant get out of

My data contract with Cell C comes to an end on the 9th November 2019. I phoned Cell C on the 5th October to make sure that my contract did not continue on past the end of my contract date. When I called on the 5th October, I was informed that I need to call back on the 9th to notify Cell C of my cancellation. As your cancellation department is only open Mon to Friday, I was able to call back on Friday the 8th November to cancel my data contract. You guys make it very difficult to cancel a 2 year contract that has come to an end. The cancellation department now says that I need to give 30 days notice. I just want my contract honored and for my data contract with number *** to end on the end date without the run around. When I asked the cancellation agent to escalate my call, I was put on hold for 15 minutes and then the call came to an end. I called on Friday the 8th November at about 16h30 from my *** number. Plz just ensure my data sim card *** comes to an end on its end date (9th November) and that I do not continue this data contract on a month to month. It's not much to ask.