Hi, looking for advice on behalf of my son who is the owner of a 20 plate Spacetourer, bought from new. For past 18months to 2 years he’s had constant AdBlue emission errors appearing, forewarning of very little mileage remaining etc. He’s broken down returning from Scotland necessitating recovery, needed roadside on numerous occasions. The car has been in and out of the main dealers so many times he may as well show them as the registered keepers

It was taken back between Christmas and New Year, the day before he, wife and my four grandchildren were travelling to family in Ireland. Released that day and he was assured it was repaired, good to go blah blah. Same old story “it’s been sorted, new parts fitted . . .pay us money and you can drive it away sir. Thank you once again for your custom sir “. Needless to say the lights came on as they disembarked the ferry, and had to be limped to relatives. Local dealers closed until 2 January and supposedly UK dealer would arrange for it to go in. Garage knew nothing of it coming in but given his predicament, needing to drive back on the Saturday, agreed to slot it in. Couldn’t repair but bypassed emissions system to get him home, which he did, just. Car won’t restart, stuck on driveway.
He wants shot of the car, remaining finance cancelled. It’s clearly not fit for purpose. He and I have been emailing everyone at Citroen, local level, customer relations department (great title

) even the CEO in France but we’re getting nowhere. Can’t even get people to return his/my phone calls.
What to do now? Any advice would be appreciated. He’s freelance so losing work - either not getting to an assignment or not being able to trust the car enough to accept work. Needing to hire cars for important jobs. Family holidays, and everyday use have been ruined. His wife won’t go out with the children in case she can’t get home.
Could I just say I’m not really after ideas of what’s wrong with the car, after all the dealers insist it’s good to go every time it’s left, I’m after any advice that anyone can offer as to how the whole matter can be escalated and more importantly resolved.