Legal Question: Is this contract valid? Can my dad get sued if he doesn't go with this company?

My dad signed a “contract” to have some guys give him a quote on how much it would be to fix our roof. They said it would be without any compromise to gettting the roof repaired by them. He signed some papers and now they’re telling him he HAS to contract them to fix the roof.
Problem is, they had the name Heriberto on the contract. my dad is Enrique. does this matter? Or is my dad still under obligation to contract them?