Samsung home theatre

My daughter Melody bought a samsung home theatre system for me as a gift for my birthday. Transaction date 29 August 2015 at Metro Montana. I received the gift 10 Sept 2015. It worked fine forabout 3 months when the subwoover started to just switch off. If you disconnect the power and switch back on it works for 1 minute then the fault reappear. I took it in to Metro in January 2016 and after numerous phonecalls i have had no response. Iphoned Nashreen on 10 March and se promised me swift action and feedback. Up to today i have again had no response. I have been without this item for more than 2 months now and are fedup with excuses and poor service. I will never buy anything again feom Metro. I need my item exchanged or refunded. Tinus Kearns