I thought it was generally accepted that vws would do a Regen once per tank fill or so. My 2.0tdi certainly does.
Depends if we’re talking (1) the kind of background regen that happens when driving normally without much visible evidence (no warning lights on) and you just notice your range number drop rapidly for 10 minutes, or (2) the more intrusive version of that where it’s still no light on and it runs like a bag of spanners at idle and in the auto tries to drive around in 2nd at 40 (1 and 2 may be technically the same) or (3) the “please spank me up the motorway before I go in to limp mode and here’s a warning light type.
I had a 2.0 2012dsg Passat, often got a couple of (1) or (2) per tank, never saw a (3) in 60,000miles
As for the OP – is it a pre adblue/emissions fix car? I cannot recall what the cut off was but there was a suggestion that the nature of the fix made the cars more sooty (=more regens) but also stressed the EGR valves with them being used to bring combustion temperatures down to limit the NOX. I think I have that the right way round but in short more soot, more egr operation/stress.
I’d keep on at the dealer on this until sorted.
Not embarrassed to be corrected as I got rid of mine a while back and I’m fishing around in my memory a bit.