Bad feedback

On Friday the 30th October I had lost my Sony Z1, I then contacted my network provider MTN to advise them of the incident as my contract Is with them. I then blocked my phone and provided them with my cell phone number *** also my IMEI ***. They advised that my sim was not used in that phone at the time of incident. Whenever I call them I get different dates from different consultants, some say the last date was in September others advise it was in August. When I lost my device my sim card was in it. I'm having problems with my Insurance paying out my claim and I m not satisfied of this as I feel that they giving me the run around and do not wish to pay out my claim. I have been with this network for a long time and have been paying them at all times. I really feel disrespected as I don't get the service I'm promised by my network and it really frightens me that such a big network can not be able to prove that my sim was in the device at the time of loss. I'm going to cancel my contract and I m now prepared to move to another network also I wouldn't advise anyone to use such a dodge network that ****s people.