Cellphone claim

Can someone call me regarding my claim ,you have rejected my claim and you did not send any communication as to why the claim is being rejected.First and far most your repair people are telling me it’s because of the SIM card change whereas I have stated on the claim form that when the phone fell the phone switched off and stated no service the SIM card does not work even now and we had to test the sim on a different phone to see if it will work and you guys are now telling me that you won’t fix it because you placed a different sim in the phone you are full of ******* and someone must call me about this