MTN UNFAIRLY HANDED ME OVER AND DID NOT NOTIFY ME

I was handed over in August 2019 for missing some payments on my MTN data account since i switched bank accounts. Rightfully so when i checked and double checked all of my debits had been transferred. Now I've been getting harrassment SMS messages from VVM that my account has been handed over. The last time i checked MTN is meant to alert you if you're about to be handed over????? From R1200 they expect me to pay the full data contract price of R2400??? Without even notifying the customer!!!! Such pathetic service!!! I've tried 25 times to get hold of their legal department to sort this out and thats an even bigger joke. The biggest joke is when i went into the MTN expects a customer to pay the full amount without notifying them that their account has been handed over and BLACKLISTED