Incompetence being the only Service Vodacom Offers

I'm disappointed at the level of service I've received from Vodacom. I've been a loyal customer for years, and plan on cancelling once my contracts expire. I called querying my contract and ended up speaking to someone regarding an upgrade. She was supposed to call me back the next day as I had changed my mind on the contract chosen. I received no call back to change the contract and the new phone contract was delivered. I called for it to be collected the day after delivery and it was collected. I call in the next day and am promised the upgrade will be reversed once it is logged in at the factory. On the 1st Sept I get a message to confirm the order was returned. I call in, and the lady promises to reverse the contract to which i get disconnected and have to call in again. I speak to another lady who assures me it's done. So I go online to choose my upgrade but it doesn't allow me as I've already been "upgraded". I call in again and the guy gives me some story it only cancels the end of the month. I say to him no I returned within the 7 days and this should be cancelled. He gives me attitude so I disconnect the call. Hoping in this week I'll get someone who is trained properly and interested in retaining a customer. However I get my statement tonight with the returned contract figures. How difficult is it when the phone was returned in less than a week? The level of incompetence from so many individuals is alarming. I want that contract cancelled immediately and to be notified ASAP. I NO LONGER WISH TO UPGRADE AND INTEND TO CANCEL.