Second-hand financing: 3.33%, now 4.9%?

Hello guys, I fell in love with a used S80 with the friendly around the corner. He stood with a sticker on their parking lot, which promised a financing with 3.33% p.a.. I signed the purchase contract about half a week later. Today I wanted to pick him up and sign the discussed financing contract. But look here: now 4,9% p.a. on the contract! The friendly said that he couldn’t push it further down at the bank. “This is how we have What do I have to do? What would you do? Here are some dates: Fz. Purchase price: 10990,- EUR Advance payment: 4300,- EUR (of which 1300,- EUR for the old car) Monthly instalments: 150,- EUR at 36 months Last rate: approx.2500,- EUR. + summer tyres and steel rims for the current winter tyres free of charge (or from 1500,- to 1300,- EUR for the old car) The deposit and the monthly rate, depending on which the running should be 3,33% p.a. had been assured to me 1. by the advertising on the car and 2. in the sales interview. Hope for soon answers. the matt