Car sales problems

Hello dear community, the following problem: I am just about to sell my current vehicle, a car dealership had contacted me via AutoScout24 and made an offer. This sounded good for me for the time being and I confirmed the price by e-mail without signature / formal contract or the like. An employee of the car dealership then wanted to look at the car with me and if everything fits me the money by instant transfer. The whole thing is about 1 week ago. In the meantime h However, on TrustPilot etc. I found very questionable reviews about the company and decided against a sale to this company. Money did not flow, also the date on site did not take place. I withdrew the whole by e-mail and asked for understanding. Now, however, the car dealership wants to force me to a sale “because we probably have a legally valid contract through my mail. If I do not sell the car to you, directly with A You have an opinion here, 1.2 options for action for me. Thank you for your time! Best regards