JSW Car Sales in Setchey, King's Lynn

My son brought a car from JSW in November. After a month he took it back to have injectors done. The same thing has started again, he phoned them today and they told him it was the coals pack. He took it to a relayble garage and they asked him is it diesel which it is petroleum and something is sticking he may need a new engine. MOT should be in September so don't know what they are playing at but please stay away from them think may get in touch with watch dog to see what they say because they don't want to know.