filter would defo have helped, if only to remove any potential blockage in the filter as a cause of a fault. To be honest it's a bit of a job if the garage isn't used to doing it - the parts aren't particularly expensive but it's a couple of hours work with a decent wheels-free lift and vag-com to monitor the box temps.
9 litres is the capacity - mine had a filter change as well, detailed in the transmission section, and my mate only got 7 litres back in of which about a litre came out with the filter - the torque converter can't be emptied of fluid without removing it. Would expect no more than 6 litres to have been pushed in if all they did was drain and refill.....
To be honest with a definite fault going on, it probably would've happened whatever the garage did.
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