Mike's Pre Owned Superstore

I purchased a used car from Mike's and negotiated based on out the door price. I was quoted a price and signed the loan for it. A couple of weeks later, I received a call from my county title office sayi on out the door price. I was quoted a price and signed the loan for it. A couple of weeks later, I received a call from my county title office saying that I owe close to $1000. Mike's miscalculated the sales tax, I believe, to give me a lower price. I'm locked in, and now have to pay another $1000 on the car. I would strongly discourage anyone from doing business with them! More