Rain Billing and Retentions

The Worst Service provider with regards to Billing.

Called in to cancel due to MTN having a better deal , was promised a discount to match the MTN offer i was going to take. Thought is was resolved till the bill kept on coming thorough at the original price, every month i have called and get the same response from their Call center stating that it will be resolved and credited.

6 months later I haven't been credited, I'm told that there is no record of said discount, the retentions team keep closing the query without any feedback.

I'm at the point were i should just accept that Rain has no sense of customer service and maybe change is necessary.