Poor service deliver and refund due

I've had my cellphone contract with Telkom for two years, that ended in May 2020.Since June they should've only charged me for they airtime and data because the phone is mine after 24 months, for 5 additional months they have been charging me the full amount R169 as per the agreed T&C's as per the initial contract.They have a Call Centre that you cannot get through too, however when they need to offer you an upgrade they can get hold of you....I spoke the upgrades consultant Kurt Rezadt and asked him to assist me to escalate my complaint, who advised me that his Teamleader said that it is not within his mandate to assist with customer queries and I need to go into a store and when you are at the store they still call the Call Centre, how are we as customer ever going to be assisted….I've also escalated this matter to the TCF commission and I'm going to reverse my debit order until someone calls me to sort out this mess.