Microvawe

In desember last year i bought a microvave cash. In May the microvawe started giving problems. Because of my mothers death in May i took it back in june. After two weeks they phoned me to say nothing was wrong with it. I refused to take it back and lodged a complain with head office on the 2nd of july. They phoned my husband on the 3rd that they would investigate. I got area managers number and send him a message. He responded that he would investigate on the 9th. On the 10th i met him in the store. He showed me a video that he tested the microvawe and that it is actually faulty. He asked me to give him seven days because he was gonna show the video to Defy and promised me a new microvawe. He said he would'nt have been happy if he was me. Its almost two weeks that i heard nothing. The store is telling me i should take it up with him. Mr Willard does'nt answer messages or his phone