I bought a 2012 BMW X3 diesel advertised as ULEZ-compliant. I discussed the necessity for Euro6 with the salesman in the initial telephone conversation and was assured that the car is Euro6 so is ULEZ charge exempt. After buying the car, I became aware of the TfL ULEZ status checker and searched for the registration number, only to find that the car was not ULEZ charge exempt. I then requested a Certificate of Conformity from BMW to either correct the TfL record or to prove the car had been falsely advertised. The Certificate of Conformity confirms the car to be emissions category 5J, and therefore not ULEZ exempt. I raised the issue with the dealer who refuses to respond to the complaint. As always I have saved copies of the advertisements. What recourse do I have?