Vodacom are money *******, stay away from them!

I cancelled my subscription 2 months ago, via whatsapp to the last tech, phoned vodacom to get it cancelled, the lady said they take a months notice. Vodacome deducted R1600 from my account, yet I went through all avenues to cancel, including sending an email. Saturday they want yo debit my account for R799?? For a service I stopped using almost 3 months ago???? I did my part by inforking them im cancelling, the vodacom staff are the ones not doing their job properly, costing us to lose alot of money, for something which is not the customer's fault! They quick to say "our calls are recorded" but cant go look for my phone call that I placed 3 months back. Called them saturday & phoned this morning, to be told i must give them another months notice??? Utter bull****!!! I DO NOT OWE THEM A DAMN CENT & THEY KNOW IT!! VODACOM IS DOING ******** DEBITS ON MY ACCOUNT! EVERY VODACOM ACCOUNT I BLOCK, THEY USE A DIFFERENT ONE! *******!!!