Got some closing cost credit for a new home purchase with a builder, but we just found the contract required us to use the builder's mortgage company for this credit. The sales person indicated "if an outside lender has better rate, a buyer is free to go with that lender and still has the credit," . We asked the sales person to put this in the contract in writing but she said it is not necessary and it's never been an issue before. Should we insist on putting this in the contract?