Incorrect billing and worst customer service ever

Literally the worst network provider ever , my husband has been calling in since 1st April till today he has spoken to over 13 agents who always cut the call instead of assisting as telkom misses debt order and also add on subscription without permission , it's such a big inconvenience the store advised to do the payment now once the payment is made via eft den after they did a debt order taking out money twice as we been calling in with no proper assistance what's the point having a customer Care line if they are *********** in assisting and cut calls it has become rather frustrating as a customer where even team leaders don't assist