Vodacom refusing to cancel my subscription

I have 3 lines with Vodacom, I want to cancel my subscription then they block my number from calling their call centre.

I’ve called in October to cancel however my account was in arrears they said I can’t cancel because it’s in arrears. I then paid before month end October to cancel they say they can’t assist with the cancellation they try to sell me things I don’t want , I’ve called 3 times this week no one wants to assist all they want is to sell me their products , which I am no longer interested in because of their terrible customer service and blocking the number doesn’t make things any easy because one can only cancel via calling their call centre.

I want nothing to do with Vodacom they have terrible customer service. All I want is to cancel my subscription.