Faulty hob

This is the 4th time in a few months I'm writing about them.Purchased a faulty stove from them last year and ever since I got it its a nightmare,guys from defy changed the housing for the plates 3 times and after a single use the entire thing jus gets wopped.The last email to hello peter gt makro to get defy to contact me,the manager from defy wasn't in the least bit helpful and according to him he wil contact head office and get back to me,which he didn't,instead he sends me a msg to say matter has been resolved,which is a lie.Its like the same story wit them everytym.