These people are ****ming us . We need help.

I sent a car for service after getting an authorization from them but it took them 4 full days as they couldn't pay the same day. This meant that I missed 4 days at work. When I cancelled with them they asked me to pay R3200 cancellation fee.now the problem is I am asking them to give me the break down as to how they arrived at that R3200. They fail to that do that