Mtn insurance

U am utterly dissatisfied with the service from MTN, in particular, the insurance. Almost 19 months ago I took out a contract with MTN Galleria(KZN). I was offered insurance for the handset (S7 edge) and agreed to insure the handset. Withing the first month of having the device, it was found to be defective so I returned it to the store and they in turn gave me a new handset as per their policy. After paying for insurance for the past 19+ months, the screen was cracked and I wanted to have the device repaired. It was then that I found out that the device that I have paid insurance for for the past 18 months was not insured. It turned out that when I had returned the initial phone, the imei number of the new device was not changed neither was I notified that I needed to change insurance details.

Now MTN is refusing to have the insurance changed.