Cosmetic damage to my car but Santam deems it a write-off

My car was badly sc****d and dented in the front in a parking area and whoever caused it didn't leave their details. My car was taken to Dals for an exorbitant quote of almost 50k and Santam informed me because the value of my car is only almost 80k this is deemed a write-off. Now I'm asked for my Natis documents in addition. In other words, they want to pay me out for my car. My car will then be fixed and sold at a profit by them. WHY did I take out insurance? To be taken for a ride like this? Years ago when a truck drove into the back of my car, the claim was hassle-free. I am sorely regretting coming over to Santam. How on God's green earth can a deep sc**** and dent to a bumper cost almost 50k? HOW? Dals are infamous for overquoting. Just check their bad reviews. I did not work my butt off for a car to be taken for a ride like this! My car is NOT uneconomical to repair. Use reputable people!!!!