GWM Edenvale USELESS!

My boyfriend purchased a second-hand vehicle from GWM Edenvale (Please Note: upon test-driving the vehicle on the 26th of May 2018 ABSOLUTELY NOTHING was wrong with it) he received it on the 1st of June 2018 being told that the previous day it was serviced however, it is now the 17th of JULY 2018 and he is still having problems with it. The first lot of problems took them over 3 weeks to fix and when receiving it back a new problem would arise. He is now sitting with the Malfunction Indicator Light being on for over two weeks, with them not being able to figure out what the problem is, each time they say "they have fixed it" it just comes back on again. Their customer service is horrible and its alarming how they treat their clients cars . My next step will be reporting them to the Ombudsman.