just to share my experience, my husband's car broke down when we were from melaka trying to go back to kl. 

our car de gearbox went kaboom, car stopped at middle of the road, den called PLUS help line, they are fast, reached our place within 15 minutes after my call. initially they tot of helping us to pull the car to the nearest RnR, but because of wat reason i forgot d, they cant do tat, they just drag the car to the roadside and help us put ice cream cone behind us. and den the RONDA came and record.

Den, right after the car is drag to the roadside, an indian guy stopped and offered that he can help to call ppl and tow the car to Seremban. luckily i got called my dad and his staff, they already start finding ppl to tow our car, so we refuse to let the indian guy help and he drove away. After he drove away, the RONDA said, lucky u all din let him tow the car, or else, later kena bayar kao kao. even the RONDA oso advice us not to let them tow to Seremban, he said a lot of cases already.

So next time, if anything happends while you are on the PLUS highway, do call their helpline, they are fast, professional and might not charge you cuz my case is only drag to roadside and put ice cream behind us, so they din charge us anything.