Help me with lewis

I opened a Lewis store account in January of 2018 fora Defy 20L washing machine, the washing machine and been repaired 3 times in the first year of purchase and not replaced and now it is broken again, I want into the symphony walk branch on the 1st March 2019 to report that's its broken again, 2 weeks later a technician showed up and told me what the problem was, I have contacted the store by telephone on numerous occasions and have been into the store and still nearly a month later it has not be repaired or replaced, my accounts is has always been paid on time and in advance, when I speak to a consultant in store they tell me we did not want the technician to enter the property. Why would I not allow them in if I need the machine to be fixed and paying for it ever month. I also pay insurance for the washing machine so why are they not assisting me. I am fed up. The store manager even suggested that I open up a new account for a new washing machine, why would I do that if they are handing my situation so pathetically. I am disappointed that they would treat a customer like me the way they are please help replace my machine or get me out of this agreement. Please contact my fiance on the number provided as my phone has problems or feel free to contact me via email