Flawed contract

I bought a car from them in January 2022, only to discover over a year later that the contract I signed is flawed in terms of description of the car, which has possibly knocked up the price and they are not willing to cancel it, saying it’s the bank that made the error so they are unable to help me with that. I’m basically paying way more than I should be paying on the car that I’m driving and I feel ****med.