Faulty goods

I have never in my life received such bad service from a company.. After selling a faulty washing machine to me and claiming that I abused it, I am mortified because I know I didn't mishandled it, and their technician who claimed to fix the machine did literally nothing, didn't even tell me what was wrong. Later I learned that he said I ran a laundry from my home and the machine was overworked, which was utter nonsense seeing that I only did washing once or twice a week. But the cherry on the cake is they are ignoring my calls. I can't get hold of the Branch manager for feedback in Strand cause she is neva available, either out on lunch or in in the toilet. Same goes for their head office customer complaints/service, the agent is or on leave or on tea everytime I call. Then they take my details saying they will come back to me but never do. The washing machine is still under guarantee and has a extended guarantee on it as well, but they expect me to fix it out of pocket, and I am still paying my installments monthly. It has been more than 5 months now that I am paying for something that I can't even use. They lost a customer for sure!!