MTN contract cancellation department

Hello, MTN retention /services are ****mers. I have been getting calls to upgrade and I rejected and told them if my contract is expired, they should put it on prepaid and they refused and told me to phone 083 135. Which I did and spoke to Zandile Nikelo who advised that I can cancel since my contract is expiring on the 7th of July, which I agreed. I then got sms for cancellation and 30 minutes later I got sms to thanking me for an upgrade which I didn’t do. While I was confused I get a sms of debit order mandate, which I declined. I immediately phoned them and they told me cancellation and retention department closed at 17:00. I am disappointed with MTN customer services as they are unprofessional. Cancellation and upgrade are two different things.