The bottom line is this: there is no piece of paper that the company could show the IRS that would cause the IRS to pay your refund to the company instead of to you.
You might have promised to pay part of your refund to the company after you receive it. Or, there is a form you can fill out if you want to split your refund into two different bank accounts. Most people use this if they want to divide the refund between checking and savings or between checking at a brokerage account. You might have promised to use this form to deposit part of your refund with the company. (However, this does not seem likely, because most of the time the IRS will not deposit a refund into a bank account unless the name and Social Security number of the bank account owner matches the taxpayer.)
You will need to read the contract, or possibly call the company to clarify what they want you to do and what you supposedly agreed to do.
