Unfair treatment

I got there bad treatment from this company,last week went there to buy there car and they processed my application,today in there morning I had to go get there car they sold it but they did take my information to apply for that car.only to find out today there car I agreed on was sold and worse their manager said he will give me another car same price,but when we had to continue so I can sign there car price it's more than what we agreed on,cause it's a 2020 model. Who's problem is it me or them.