Ok, so spoken to a second VW dealership which told me the same as the first. which is:
"Unfortunately, because the car has been remapped, we wouldn't want to put the Standard Map file back onto the car in case the car didn't run correctly afterwards"
So I asked whether or not there is some kind of a waiver I could sign regarding this.. and was told:
"even with a waiver, we still wouldn't be able to do it - as we have had trouble in the past with waivers present"
Basically, they wont do it lol so I'm going to have to get MDM Technik to do this for me, which they have advised its a VW file not a Revo Stock file. either way, I just want my map file flashed over and replaced so I can help diagnose my issue!