yes it seems you have been conned by the garage,what sort of garage was it,a bigish one or back alley one.go back to the garage and demand your money back or you will contact your local trading standards office and report the garage,also that you will contact the police and local paper,if they dont give you your money back.if you keep the car,you must get it VIC tested at a VOSA centre to confirm the car in question is the right car and any repairs that were made,were carried out to road standards,once the car has passed the VIC test,you can then apply to the DVLA for a V5 log book.its quite a easy procedure.