SAN Parks Booking Tips

Hi all,

I waited until SAN Parks opened their bookings for 11 months ahead by 7:30 in the morning, all campsites that I wanted in the Kgalagadi were gone. I see that telephone bookings open a day earlier than online. Is the only way to get a booking in the Kgalagadi to wait on the phone for two hours on opening morning? Any tips would be appreciated!