Vodacom Cancellation Department did not cancel my contract even when I called and requested for this to be done!

I’m actually very ****ed!

I called Vodacom last year to cancel my contract which was due to expire in September 2020 to let them know to cancel it and now I’m being called by debt collectors saying I owe Vodacom? How? When I personally called and requested for the cancellation and was told it was cancelled!

Vodacom is messing up my credit record!