I bought an Audi A5 in May for my wife's special birthday. I paid £1600 extra for the Sat Nav system. She needed to use the Sat Nav a few months later and found she could only input five digits of the postcode, then had to enter the address. I queried this with the distributor who supplied it, who said that it was correct as they did not use 7-digit postcodes in Germany. I assured him that I would not have bought the system if I had known this and I would like him to recompense me for his error. This fell on deaf ears, so I wrote to Audi service who tell me that they are now rectifying this problem on all future models, but still would not give me any recompense. Is there anything that can be done for false selling? Any advice would be appreciated.