You have a duty to read before you sign a contract. In this case, they can claim you tricked them into thinking you'd signed the form contract, and that they r

You have a duty to read before you sign a contract. In this case, they can claim you tricked them into thinking you'd signed the form contract, and that they relied on that agreement when they provided you care. IANAL, but I suspect you will lose this unless you can show that the staffer accepted your changes knowingly.