Contract cancellation

I called Vodacom to inform them I wish to cancel my contract on the 8th of March 2024. I had long lost the device with the sim and since I have a main number, also on a sim only contract with vodacom, I decided to keep one instead. I was told I’d receive a cancellation confirmation. When I didn’t I called customer care again on the 28th of March at 15:15 and was assisted by a guy who introduced himself as Lincoln. He said he could see on the system that a cancellation request was logged on the 8th.

Thought I’d wait for the 1st of April and the number is still appearing active on the app and vodacom is billing me. When I do not pay because I’d informed vodacom I wish to cancel after honouring my contract without fail to the full term I know I’ll have my account suspended when it’s not even my fault. Should I be charged for this sim vodacom better know I’ll reverse the funds without shame because you guys are bullies