Annoying service and false billing

Vodacom continues billing me since April 2019 when I gave them 30 days full notice of cancelling two of my 4 contracts. The people in the stores cant assist me. The cancellations number you call is useless. They did my upgrade to a red package easily and effortlessly but refuse to cancel my other 2 contracts. In addition they charging me for insurance when I didnt ask for it. Either way you fail with them. I have tried to email and escalations email address to no avail. I'm so tired of this pathetic company but it's impossible to cancel any contract. I'm not sure what happened to treating customers fairly. It is impossible. I wonder how good is MTN? Or cell c? Or rain ? Really painful and the situation is completely out of my control. Sad and angry