Cannot cancel an expired contract number

Dear Vodacom, I moved out of my home (Aug) and have been trying to cancel my alarm sim card/number using ***... nothing nada zip happens...the message is in a loop...tells me to select 2 for cancellations, tells me to enter the number, I do, tells me if I do not immediately get an email and/or sms confirming cancellation I must dial ***...seriously? How many times must I do this? What do I have to do to get this number cancelled? This contract expired in 2018, so it was a month to month?

HELP PLEASE

Ingrid David