Air Transat complaint: Airline prevent passengers to board due to outdated infomation

On July 6, 2022 at the Toronto International Airport, my wife and I was prevented to board Air Transat flight no TS360 to Amsterdam, the reason being that the check in agent and her supervisor at the check in counter stated that the Dutch government mandate passengers with COVID vaccinations for more than 90 days have to have a booster shots, regardless of age, and reasons, and no exception can be make
However, I am now attaching the Dutch government mandate to show, since Sept 2021, any grand parents regardless if they have been vaccinated or not are allow to enter to visit their grand children.

As a result of this lack of updated information by the Air Transat agent and her supervisor, we lost the return ticket in the amount of $2,395.82 plus $72.32 for taxi that we have booked at Amsterdam airport
Despite what Air Transat claimed to be the Dutch government’s policy, we were able to book and fly with KLM on July 8 to Amsterdam without any restrictions and instances.

However, our replacement flight was $4,727.22, a difference of $2,331.40 plus $381.90 for 2 days loss of hotel room. Therefore, we are making a claim of $2,785.62 (replacement ticket price plus taxi and hotel room loss). After call Air Transat customer’s service numerous times, I filed online on July 29, 2022, but still have not heard back from anyone.