HELP MTN is killing me!!!!!

I have been trying to upgrade for 6 months,MTN advertises specials but never have stock. In June I received a SMS to say my contract expires 21/06/2015.Yesterday my phone broke,I went to MTN Cape Gate. The guy tells me they still don't have stock of the phone I want. I asked him to change my contract to pay as you go so I can convert to a different network that has stock (MTN's package is R200 a month more and they have no stock ***?) His answer to me is my contract only expires on 21/07/2015,I should come back on the 22nd to change. I was still sitting in front of him talking to him when he called and helped the next customer .This morning I went to Stellenbosch MTN and asked if I can buy out the last 2 weeks of my contract as I didn't want to buy a new phone just for 2 weeks. He said I could but it will cost me about R1500. My contract is only R350 a month??? I asked for a report on my phone and a quote for a new phone for my insurance and was told they don't do that. So I can't claim the phone from my insurance as I cant get the documentation they request, I cant upgrade to a new phone as they have no stock and I cant cancel my contract till the 22nd. What am I to do????