Excessive Drop-Off parking fines at Lanseria Airport

Yesterday I took my friend to Lanseria airport to fly to Durban 09:40. We left Pta North at 07:30 to be in time at Lanseria at least 09:00. we arrived at the R104 Lanseria turnoff road at 08:30 so another +/- 25km or 1/2 hour to airport. estimate arrival 09:00, which should be ok. Unfortunately we did not know that the road is clattered with 2-trailor coal lorries from Limpopo, their were 4 lorries ahead of as resulting that we could not pass them and arrived 09:20 at the airport and parked at the drop-off parking and proceeded to registration, they informed my friend she can still board but the hand language can not be booked in we have to send it in another way. After discussion they booked my friend on a 12:50 flight to Durban which was R400 more expensive. so we waited in the entrance hall, and she exit 12:30 to the departure wall. When I got to the carpark which was basically empty 6 cars included mine. My cars one wheel was clamped and the guard informed me I have to pay R500 to remove it. He took me to the office where I explained to the lady why my drop-off took so long (she was on the phone for about 10 min.) before she helped us, she responded that I must pay the fine but she will reduce it to R250 if I put in a written complained which I did. So I except that I did overstay the drop-off parking time but it was because of reasons out of my control, the airport personnel will definitely know about the coal trucks on the road, I did not know about that if I did I would have allowed more time, and if the parking area was full when I picked up my car I can except a fine, I just feel I got a a bad deal from Lanseria and the R500 is excessive, for me it is time to change airports, which I used for 15 years. so friends if you going to Laseria be careful of the drop-off parking area. the parking their is very expensive!