Code 10 surcharge not disclosed.

My husband hired a car this weekend. Today he receives an invoice stating he will be charged a code 10 surcharge. Why was this not explained so we could walk away and hire at a car rental that does not class you as being a hazard on the road because you have a code 10 licence. We were not aware of this and neither was it explained when hiring. Surely the staff at the check in know this. He will Definitely not be using them again especially for the lack of transparency.