I am Vodacom customer since 2012

I am Vodacom customer since 2012. I supported them since by upgrading my contracts with them since then. Lately, they started an ******* way of gaining financially were they had debited my account before the actual agreed date which in return they wanted me to pay more than I should pay. December, they debited my account on the19th instead of 20 and there was not enough funds for the amount they needed. I end up paying R200 extra. January 2023, they debited my account on the18th instead of agreed date of the20th and again there wasn't enough money for them. My worry is I have to pay more because of their *********** or scandal they are up to. I agreed for my account to be debited on the 20th not early or after the agreed date which inconvenience me and the way I budget. I hope this will help even others and probably Vodacom will stand up and do what is right.