Disgusting service

I purchased a cellphone on my Truworths account in July this year. The phone was not even 7 days when it stopped working. I took it back to Truworths at Diamond Pavillion Mall where I bought it. They sent it for repairs and returned it to me. However it stopped working again. Everytime I take it back it takes 21 days for them to return it and yet it's still not fixed. It has now been 4 months and it is still a problem. How can I pay every month for something that I'm not even using. I can't even keep in contact with my own children and family because I don't have a phone. This customer service and treatment is unacceptable! The staff at Truworths do not take me seriously and they keep giving me a phone that does not work. How is it that a brand new phone can be so broken? My family and I have been loyal clients of Truworths for years and I have never been so mistreated in my life. You people need to credit my account with the value of the phone and refund my payments, as I will be closing my account. I want the CEO Michael Mark to personally phone me and apologise or I will take this further to the Ombudsman!!!