GP Sales Limited

Where do I start, I brought a 25k car from these people an 4 months an only 3396 miles later I have had to replace turbo an oil pump at a cost of £4500 an the company has left me to the bill as the rac policy they sold me don't want to know either, they offered to pay me 10% of the bill but I declined, the garage I had my car at told me that this car had not been serviced either before I brought it as there was sludge in the sump an looks like its not been serviced in years, please avoid as there not as reputable as you think I would never trust a trader again after this experience