Check that you've entered the correct amount under Tolls & Others when ending a trip. You may receive an error message if you've entered a wrong surcharge.
If you're a taxi driver, please enter the final fare on the taxi meter into the Meter fare field. Don't worry, the final fare indicated on your taxi meter will include the ERP thus there's no need for you to input it separately.
Let us know, after checking that the surcharge entered is correct, if you are still unable to charge the correct amount in Tolls & Others.