Here's the thing.
When I got lost, I had the following:
1) Approved paths on Table Mountain (MCSA)
2) Peter Slingsby - Table Mountain
3) Mike Lundy - Best walks in Cape Peninsula (1989 - very old)
4) Adventure trails in Western Cape (?) - Karen Watkins
In addition, I was an experienced hiker, as was my hiking partner. Both of had, at that stage walked table mountain extensively.
My point, no matter how well prepared you are, it is still easy to make a slip up. Be careful, it doesn't just happen to tourists.
Oh, and make sure that you have the gear to be able to last you a night on Table Mountain.
Regarding mountain rescue, by calling them up, you are endangering their lives, and it is probable that if you are able to survive for the night, they would rather fetch you in the morning than risk going up themselves. If it is getting dark, you should not try to keep walking, but rather find a sheltered place to settle for the night. On this part of the mountain, I would recommend the shelter below Judas Peak.