9 times out of 10 it is the worm gear in the reclining mechanism that has disintegrated. The problem is that this worm gear is not available as a single small piece of plastic from the agents. Whoever is repairing this in Durban will be using scavenged worm gears from other broken seats to effect the repair. The E36 M3 seats were particularly prone to this problem.
If you can get it repaired for R1k you should throw money at the problem sooner rather than later, supply of used worm gears is bound to dry up in the near future.