Really bad customer service which may cost us about 4000 pounds. Kwikfit Giffnock on Fenwick Road, Glasgow incorrectly entered the mileage during Mot in 2022 to my wife’s car adding 20000 miles onto the mot certificate. Then said they couldn’t change it and would have to go through another mot so they could add a note onto the new mot…this was done but now my wife’s car can’t be taken as a part exchange worth 4000 pounds when buying a new car as the system at the national mileage register has not been updated and kwikfit are stating they can’t contact dvsa to change the mistake as there is NO proof of the original mileage in the first place and even though it is clear that it is the testers mistake, Kwikfit say there is nothing they can do with regards to an official change at dvsa. All they can do is issue an apology but that doesn’t help the situation as anyone taking the car as part exchange is insisting that this register be updated instead of showing a 20k mileage doscrepency when the cars mileage os searched.Now my wife is u able to sell this car. Customer service person who is apparently the manager at customer care team at kwikfit confirms this is all Kwik-Fit can do in this case.