Third party claim went sour!

Mr. See (not the real name) was driving a van when a motor cyclist collided into his rear. A man saw the incident and claimed that he is representing workshop X. He took Mr. See to the workshop and advised that this is a straight forward claim and agreed to make a claim against the insurer of the motor cycle.

Mr. See was asked to sign some papers in small print and was offered a free rental car for 8 days. The car was also repaired at no cost to him.

!8 months later, workshop X told Mr. See that he was not able to claim from the insurer of the motor cycle and asked Mr. See to pay for the repair cost, amounting to over $10,000. Mr. See refused to pay this bill, as it was above the market rate. He received a writ from the lawyer acting for the workshop.

What can Mr. See do?