The camera idea makes a lot of sense.
Once you've got the evidence, do as suggested above.
I think you'd be within your rights to reject the vehicle and deliver it back to the dealer and demand a refund. I don't know how finance etc would complicate this.
But as I understand it your contract is with the supplying dealer but it might not hurt trying to involve Suzuki GB.
I also think any refund would reflect your use of the vehicle to date, condition, mileage etc.
Good luck, I think you're going to need to be persistent or a PITA.
Upt'North.