Electrolux — facing problem with refreezarator

since april2015 Several complaint has been lodged, each time the technician attended, changed a parts or other but all in vain. Atlast they said, compressure has to be changed, they changed it on 23 rd may, i.e last saturday, but again I am facing the same problem. Each time I am paying the bill for the parts changed, filling gas in the compressure, etc, which is just emptying my wallet but all in vain. I would like to know what is actually the problem? Are the technitians attending inefficient? They are not even tell clearly about the fault. Whenever asked, they say that they are seeing to it. Eachtime they are failing and I am facing the problem in this scorching heat. Will they be able to solve the problem at all? Howmuch more money will I have to pay more each and every time in the name of changing a parts?