CLAIM REPUDIATED BY MTN INSURANCE (GUARDRISK)

I took out a contract with MTN in Dec 2018 for a Samsung S9+, when taking out insurance I stated and it was noted on the forms that I completed that the number to be used in the device is for a different network. My phone was ****** and I lodged a claim with MTN insurance on the 8th October 2020. The only time I got feedback was when I made an enquiry. I made several enquiries and only on the 10th Nov 2020 when they informed me that the claim was with the underwriters and until the 19th Nov I heard nothing from them. On the 19th Nov 2020 when I made another enquiry with MTN insurance, I asked them about their turnaround period and they said 7 to 14 days and told them they should note that my claim is now six weeks since I lodged a claim. The lady told me to complain with MTN insurance which I did and on the same date 19th Nov 2020 I send a complain to their underwriter which is Guardrisk. All this happened before noon. Later in the day they after 16:30 just after I knocked off, they send an sms to the MTN number that is used by my daughter notifying me that the claim is denied and are cancelling the insurance due to, as per they email received at 16:35 that: 1. the number used in the device was of different network - this is stated in the insurance documents I signed, they must make it available 2. When the phone was ****** it was unattended - it is stated exactly what happened in the affidavit, the office has always been a safe place I only got feedback after contacting Guardrisk. What is insured here, the device or the sim?