Not satisfied

On several occasions in our complex we had power failure, sometimes due to lightnings and thunder storms. Before that my fridge was working perfectly. After these incidents when the power came back i noticed after some days that the fridge is not freezing the food on the freezer side. I then lodged a claim where a service provider was sent to check the fridge. The report i received from my insurance is that it is wear and tear its not power failure. My issue of not being satisfied why this will show up after power failure. Again in my policy nothing specified that damages caused by wear and tear evaporator fan to be specific will not be covered. It's only power failure, where i have reported that. I am not happy how I am being treated.