I am at my wits end with Vodacom and their migration contract nonsense!

I have lost count of the number of times that I've had issues with Vodacom's migration contracts. Yet again despite having notified Vodacom that I was put on another migration contract instead of the agent cancelling the contract because the contract was coming to its end - Vodacom only cancelled the migration contract and not the contract as well. I have been charged since July 2019 for a sim that I no longer have. I picked this up a week ago since I noticed that the after cancelling voice and data contracts that my bill still came out higher. I have not used this sim since July 2019 and the airtime has been consistently forfeited. Currently there's 2 months of airtime which I cannot access because the contract was meant to be cancelled. Almost R2,100 has been wasted just because of Vodacom negligence. Please may the number in question is *** be cancelled immediately and post investigations monies that due to me be re-imbursed. Vodacom was getting money for nothing! What a nerve!