.......Abit dissapointed and .... crying ......

I am a customer with MTN for a very long time. I've got 3 active contracts at the moment with them. With my last contract I upgraded in March 2016 and got an Iphone 6S. First debit order for that upgrade went off today and I am a very very sad person at the moment. The phone got ****** in April 2016 and the tracking of the phone was not activated. When I went in to do the upgrade I asked them to activate the tracking for I am not very clued up with all the new technology. The guy set up the phone so I was under the impression that he activated the phone's tracking, was even surprised when he asked for banking details when setting up the phone for I was not awhere of this . That was not done for I could not track the phone. So now i'm starting to pay for something I don't have anymore........... I feel very disappointed and frustrated about this. When we done the paperwork of the contract I was not sure about the insurance and he told me that I got 3 months to decide if I want to take the insurance on my phone with the contract. Not that it means anything now with the phone that is already some one else's item........ I feel that I was not treated rightfully when upgrading my contract and was put under a misrepresentation of a phone that I did not know off hand and was misled in thinking that the tracking of the phone was active and the first thing I done when the phone went missing was go on the internet to see what to do to track my iphone and when I typed in my details there was nothing. While typing this I feel all the hopeless and emotional stress for there is absolutely nothing I can do about my situation and I feel as a very long respectful customer always paying my contracts successfully and loyal customer please is there something you can do to accommodate me in this urgent matter. Never in the past have I ever encountered anything negative with MTN and will stay a client till MTN close their services.......... PLEASE HELP