Bad Customer Service

I app**** for a Bond with FNB and they granted the amount requested. i went to sign with the Bond Registration Attorneys and now they are declining because the Attorneys made a mistake with the purchase price. I rejected other offers and now I'll lose a lot of money (deposit paid) due to their negligence. what if it was me who wants to get out of the contract? I'm sure they were going to sue me but it's easy for them to just get out of our contract. please help