Dell — Faulty laptop provided and absolutely poor service

Address:

194A Arawali apartmemt sector 52 noida, Arawali apartment

My DELL laptop but (service tag : 2F5JFT2). hangs since first day of purchase. It hangs for hours gets heated till battery gets drained. I complained to DELL several times they can't diagnose the problem properly and give absolutely worthless solutions. Once they replaced motherboard and once replaced hard drive but problem still persist. I wanta permanent solution to this problem of laptop getting hanged. Please help. This is absolutely unprofessional on part of DELL professionals that they can't diagnose the problem every time they tell me that they do not know the root cause of problem and tell may be replacing mother board will help may be replacing hard drive will help.