as the others have said, they should have given the car a full check over before mapping the car, most tuning places know the common areas to check for boost leaks and such and then do a run, and from there diagnose any faults, run vagcom etc.
'most' tuners do offer a try before you buy type service where if you are not happy with the map, they take it off or dont charge you, so make sure you 'kindly' let them know that as far as you are concerned you have paid for a service that hasnt done what it is meant to
