what i usually do for Uber is...get a print screen of the agreed charge upon booking the ride. In almost all cases with Uber, the final fare is higher than the agreed fare. So, just have to feedback to Uber suport, and they will waive off the extra charges.

for uber....in principle, yes. But in reality, no

For Uber, once u booked a ride during surge pricing (e.g. RM 10 instead of the non-surge pricing for RM 6), you should be charged RM 10 at the end of your trip. But, for some reason only known to Uber, they may charge you RM15. So, you'll need to check and contest the extra charges with Uber.

However, for Grab, once you have agreed on the RM 10, no matter how jam it is or how long the trip takes, you will still be charged RM 10.

Yeah, me too!

that's weird....i just used it twice during lunch time

RM 4 x 20

RM 1 = 10 points if pay using card
RM 1 = 5 points if pay cash