Refund for Double Insurance, to Whom?

Hello, Some time after my wedding, my father asked me to insure myself with private health insurance instead of being under his. I approached the agent my father works with, and we agreed to set up a new policy and cancel my participation in my father's policy. About four years later, I discovered by chance that I was insured under both policies — meaning both my father and I were paying every month for the exact same policy. The total unnecessary payment was 6000 shekels. The agent tried to make the insurance company take responsibility (both policies were with the same company), but they refused, and thus he and the agency he worked for at the time decided they would compensate us with 4000 shekels, part from his own pocket and part from the agency. The dealings with the agent took a long time — repeated calls, chasing the agent, talking and asking to move forward, and asking again and again, with great discomfort, so that it took over a year! We spent many hours with him in emails and phone calls, and it was a lot of headaches and discomfort. I did all this without involving my father. My question is: is the money mine or my father's? [It should be noted that from my knowledge of my father, he would not have bothered so much, especially since my father has a somewhat friendly relationship with the agent, so he probably would not have pushed him so hard to bring the money and would not have taken from the agent's pocket — not knowledge but my feeling.]

The Beit Din's response:

It is clear that this refund goes to your father, and there is a basis to require you to pay also for the additional two thousand that your father did not agree to pay for you.