Paying for a phone that has been at the Hauwei repair centre since 8th of September 2017.

I purchased a Hauwei P10 on the launch date which was around May 2017. I was absolutely in love with it until it became faulty at the end of August. The internal speaker wasn't working, the one where the person on the other end of a call could not hear me but I could listen to music and the phone would ring. Making calls was the problem. I then decided to take it back to the shop but was told that I need to take it to the Melrose Arch repair centre myself as they had a back lock in store or something like that. I made an effort to take it there on the 8th of September and it is now the 17th of November and I still do not have my phone. I have spoken to every department in Hauwei. I have called, had live chats, went back to the store where I purchased it and even spoke to Hauwei managers but nothing is being done. Mind you, every single month, money is being deducted from me but I do not have a phone. They sold me faulty goods and now they can't replace it or fix that one. I am so dissappointed and sad I don't even know what to do. I like the brand very much and it is my second contract I took with a Hauwei phone but their customer service when it comes to repairs is appalling! I just want what I am paying for.