Shocking Service

I requested a technician to come and fit a part that I purchased for my gas hob in December. I was told when he came that I needed an additional part which I was quoted for and paid. When he came to fit that part I was then told that I needed another part which I was quoted for and paid at the end of February. They never came back to me and the part was never fitted. When I queried it again at the end of April they came to look again and I told me again that I needed another part in order to complete the repairs. It has taken them over 6 months and 4 visits which I have been charged for only to be told that another part is still required. I then spoke to the manager Vishay on the 20th May who told me that he would order and fit the part free of charge that Friday or Monday. It is now two weeks later and it is still not repaired and I haven't heard a thing back from them. I have never in my life had such bad service from Hirsch. In total I have paid just short of R4000 for the parts and labour and I still do not have a working gas hob. Would have been cheaper for me and less stressful to buy a new one.