If he hasn't been talking to the service supervisor, do so. If he has, escalate to the dealer principal (the person who owns the dealership) and let them know how unhappy you are and how dangerous it is to suddenly lose power (limp mode).
Be polite but persistent, and ask them what they are going to do that will actually fix the problem.
If you haven't already done so, start keeping a log of faults, dates, action taken and the names of the people you have dealt with (that last one often gets their attention ). That way you have something to take to VWA if needed.
2017 MY18 Golf R 7.5 Wolfsburg wagon (boring white) delivered 21 Sep 2017, 2008 Octavia vRS wagon 2.0 TFSI 6M (bright yellow), 2006 T5 Transporter van 2.5 TDI 6M (gone but not forgotten).
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