Vodacom cancellation issue AGAIN.

Vodacom has done me wrong AGAIN. I cancelled my contract and received confirmation of same on 29 January 2026. Call recordings also confirm. Today I received a call from MBD informing me that I owe them 400 odd. Vodacom has taken me to debt collectors after they confirmed closure of my contract and conversion of the line to prepaid. How many times must I argue with these guys so that things can get right? I had to argue the first time to get the cancellation right and now it seems it was never done