Jumping through MTN hoops

Came to the end of contract and decided to accept one of the upgrade offers from MTN. Initially very quick and kept up to date. No delivery. After 10 days I contact call centre by email. Respond with stack of personal info that they need. Then ask for copy of contract. After two days reply comes back, contact sales! I respond asking them to cancel the upgrade request. Reply, contact sales! Speak to sales. Nothing to do with them. I must speak to on line sales. Eventually online sales cancels upgrade request but no confirmation in writing received. Tell me I need to speak to retention department to cancel my contract. I also cancelled my subscriptions via the Mtn app. This morning I get credited with data and talk time as per the expiring contract. Call the call centre and am put through to retentions. After 10 minutes with no answer I drive to the local MTN store. Sorry, they are not allowed to handle cancellations. Phone call centre again and am put through to retentions. I hold on for 28 minutes before my call is answered. Now I have to give 20 days notice so that I can retain my number. Every month I pay another network will be very sweet.