Audi A6 not slipping into gear
I took my Audi A6 in for a genereal service. Filters etc. One of the guys working there drained my transmission fluid. After 2weeks they seemd to realise they need to take the sump off to fill it again. Now she rev's up to 5000 driving 80kmph and does not want to change her gear.
Please give me advice as I am now at my witts end