Stop dancing around the answer and just say No.
“I cannot, and will not come to help you, here is the number of a repair service.”
I learned a long time ago to never soft sell the answer “No”.
Firm, direct and unforgiving...period.
Ask my FIL who tried to take out a life insurance policy on my daughter when she was a year old without asking me and named himself as the beneficiary and gave me no rights to the policy. He mailed it to me with little sticky flags where he needed me to sign. I sent it back shredded in a FedEx envelope with a note that said “No”.