MTN cannot successfully upgrade my contract

I got a phone call from MTN to upgrade so I did and ordered the S8+ and an Active Tab on a +S contract ... waited more than 2 weeks for delivery.

So I phone to cancel my contract and they offer me 3 months free subscription to retain me. I agree and order the same deal. After a week of waiting again I phone only to hear from the first operator no upgrade was logged (second time I hear this story). After asking to speak to Temba who helped me the first time he says my goods will be delivered today and he would have phoned me yesterday to confirm.

I am still waiting and really think MTN is *********** if they cant even phone me to give an update if they do not deliver because they have no stock (after the warehouse confirms there is stock).

So MTN ... what will you now do to retain this very disappointing customer?