Sounds like the same bollox story they gave me

REALLY annoys me how people like this are allowed to trade. Apparently my EPROM was wrong and i needed a new chip (hrrrm)..
I took mine to Mikeanics in Congleton (pretty much right next to Votex Revo Dealer)
Sound guy, old skool rolling road but clearly works...
Also rolling roads his rally car offen as he does that himself (Escort Cossy - not VAG)... He said he dont get into mapping vags (understandable since there is a revo dealer next door) but obviously his done dyno runs from other 1.820VT's theyve done...
I would get it done soon tho dude, cos u should be able to take it back within 14 days if its not as you wanted.
I was dissapointed to fook - just dont want someone else to be in the same boat!