Very Poor service!!!

I've upgraded my cell contract in Jan. I received the new phone but it was faulty. They sent a courier to come and collect the phone and told me that because it was an out of box fault. I would receive a new phone within 7 days. This was on 25 January 2016. On 25 February 2016 after numerous phone calls I still did not receive a new phone or any feedback. They only then told me that they are closing down. WHY THEN SELL ME A NEW CONTRACT???? I then asked for the contract to be cancelled as it's still within the 30 day grace period. Up to today's date I still have not received any feedback. They keep cutting my calls and refuse to transfer me to a manager. Now I'm still paying for the contract and a phone which I don't have. I've been a loyal client since 1997 and this is how they treat me?