Faulty goods sold and no resolve

I purchased an amplifier which had a burning smell when I plugged it in. I took it back to the store. The salesperson plugged it in and it blew up and even may have injured him on the arm, this should be on cctv footage. The manager booked it in to test and said he would contact me the best day which never happened. I went back a week later and there was no solution. I waited at least 20min for the manager to come to me after he had asked me to wait. He had no solution and rep**** and I quote "Bru log a complaint with our complaints department" , it's been a month and nothing has been done.