CHARGING ME FOR CANCELLED CONTRACTS

I am here again to vent my fury at how pathetic Vodacom has become. Once a top service provider they have most certainly gone to the dogs now. I complained a while back about how I had cancelled my 2 data contracts numerous times, before the termination date, how i kept calling to double check all was in order and cancelled etc. But today I get a statement for over r2000, when my bill should have been R694.99. contracts due for termination 24 Nov 2019. After much phoning and screaming at them, in December I paid R694.99 which was correct as per my other 2 current contracts. Today for January I get the bill For R2038. Now where in hell's name, in the last month, did my 2 cancelled contracts become re-instated? How *********** can they be to fail at a simple task of cancelling a contract honestly!?? and for the love of Mary, they HAVE THE NERVE TO CHARGE ME r594 EACH FOR 20 GIG DATA???? I WILL NEVER DEAL WITH U AGAIN