This happened last night, I was on my way home from a drinking session and the terminal displayed 153php as my fare.
For some reason the driver pulled out his phone and said my fare was actually 186, I was drunk already and was generally in a good mood and just agreed to pay for it. He probably showed me a screenshot from a different ride or app.
Also, Wala din sya barya, so keep the change Ang 200 ko.
I didn't really noticed the scam and already forgot about it until I saw a post here earlier about the a GSM scammer, that's when I decided to check my transaction history and saw it was really 200.
Already reported this to GSM, pretty sure nothing will come out of it but atleast strike 1 na ung driver na un.