MB Northcliff STILL unable to fix 10 month fault.

For the past year, my vehicle has been in and out of Mercedes Northcliff for once single problem - the rough idle. At least once every month or so, I am taking my car back. Each and every time, the Service manager advises that they ran the car through diagnostics and couldn't find anything wrong. I have even resorted to taking a video clip of the issue to prove to them that the issue is in fact valid.<br> <br> There was a instance where my car was sent in in December 2014 and I asked Northcliff to keep it until they fixed this problem once and for all. They had the car for almost a month and returned it in January 2015 saying that everything is fixed. Needless to say that since January, my car will be going in for the 4th time this year for the same problem.<br> <br> What really tipped the apple cart for me was when I took my vehicle to them in early June to have the error message on the message board saying \DistronicPLUS Inoperative"looked at. I received the car that same day with report that it was fixed. 20 minutes into driving"