Broken promises

When I did my upgrades we had a really terrible experience. The phones were sent to CT in error and was returned to Jhb. Got lost at the airport on its way back / in the warehouse etc... It took about two weeks for the delivery to be resolved. I was promised, by the MTN agent, 2 free months subscription fees as per a mail received on 4 October 2017. 4 months later still no sign of the credit. And now I get radio silence from the agent. I didn't ask for the credit it was offered as a goodwill gesture. I thought what great service from MTN. Now a ll I ask is that if you make the offer, keep your promise.