Whoever causes another to miss an obligatory act in Hajj has to make Fidyah

Q: My father went to perform Hajj on behalf of a man and he was accompanied by three of his relatives. They traveled by cab along with some other people. The cab driver took them away from `Arafah shortly before sunset when they could see the sun by the height of the mount. Some of the passengers asked the driver to stop but he did not respond to them. Second, they left Muzdalifah after the middle of the night. After performing Hajj my father returned home and questioned some (Part No. 11; Page No. 345) scholars about what he had done. They told him that he had to offer a sacrifice for each person who were in his accompany. They mentioned that this is because my father left `Arafah before sunset. In the season that followed, my father asked someone who intended to perform Hajj to offer four sacrifices on his behalf. That person slaughtered the animals in `Arafah and distributed the meat thereof amongst the pilgrims. A long period of about fifteen years passed, then that person who had slaughtered the sacrifices asked a scholar about what he had done. He was told that it is not permissible to slaughter the sacrifices in `Arafah but they are only to be slaughtered inside Mina or Makkah. Consequently, this man returned to us the value of these sacrifices. Since my father has already died, I received this money myself which was exactly 240 Riyals. This is the same sum of money that my father gave to the man for the value of four sheep. As you know, there is an increase in the value of sheep nowadays. What should I do? Please provide us with your beneficial answer. May Allah benefit and reward you with all the best, and may Allah's Peace, Mercy, and Blessings be upon you!