I was given a hard sell after the person did some stuff on my computer remotely. Afterwards my computer was degraded. I called in a local expert who removed everything they had installed and put in excellent freeware and voila! My computer is working well again.
I phoned to request a refund and I had absolutely no problems. They deducted what I consider a fair amount for work they had done and refunded the price of all the software that I had removed. They did not ask to look at the computer to verify it was gone.
The CS agent said that the sales people oversell for less powerful computers and I accept that this might be true. In any event, there were no problems and I feel I came away whole from the experience.