I think it will interpretation and further explanation.
repair invoice for what?
is it included in the contract?
has the bank already refused to pay the bill?
did the agent spend his own money?
was this supposed to be an as-is sale?
why isn't your agent answering this for you?
The banks, it seems, are making things much harder than they need to be. If I understand the question correctly, the seller's agent has agreed to pay an invoice out of their own pocket so any seller should be ok with that as long as it is disclosed. However, if that agent is trying to get reimbursed by the seller (bank) then you could have an issue closing on a home and rightfully so. You can try to negotiate the repair costs by all parties involved and get it in writing signed by these parties. Hope that helps! As always, make sure your realtor knows the legalities of the whole transaction. Call me if you need further clarification.
You as the buyer can pay the invoice to get it closed, maybe you can pay the difference between what the bank thinks is fair and resonable with what the listing agent paid, or you can wait it out and never get the house. Your choice.
However if it was and As-Is contract you may also be at a lose.
If you were not authorized to fix anything you may be at a lose.
This may help, however the question was poorly written, so this may just confuse even more.