(Redirected) received a faulty laptop and Dell is not honoring the warranty even though they keep telling me they will- 7 months and counting

I bought a laptop from Dell 7 months ago and the fan did not work so it went over 100*C the first time I turned it on and since then it has not worked properly. I bought it for work and haven't been able to use it. After 5 months of endless phone calls and emails their escalation department finally decided to send me a replacement- that was 2 months ago. I have no computer and Dell has thousands. My experience has been so stressful. I may lose my job as I am not able to do the contracts I took on. Sometimes I have been on the phone- being transferred from one agent to another for over 2 hours and then they cut me off. Does anyone have any suggestions? Better Business Bureau? I am typing this on my old desk top as my $1000 laptop is unusable- except as a frisbee. I would never recommend to anyone to buy a Dell- unless they have money to throw away. Worst experience of this kind ever. I bought a down coat from Columbia that had a design flaw and they replaced it with a coat worth 4X what my original purchase was. They told me they never "downgrade". Not so with Dell- they wanted to send me a refurbished computer. So frustrating- what can be done- nothing!