Sounds like it needs to be plugged in, get someone nearby with VCDS to scan it for you, decent people shouldn't want much for the effort!
By the sounds of it there might be something wrong with the central convenience unit, that's the computer that controls windows, door locking, heaters etc but I haven't heard of any going wrong and I imagine that if they did go wonky they wouldn't do anything for you!
What year is it? If its still under warranty then get it booked in
EDIT: have you checked the key isn't to blame? Try opening the door the old fashioned way and let us know how you get on