Likewise. Same happened with me at PSO but at G-8 markaz. He distracted me with some person standing in front of fuel meter so I couldn't see the meter reading. but I felt something was wrong cause it filled real quick, then I left. But my car petrol needle haven't went up from E point there i realized something was wrong I went back the other day to discuss it with the owner but he was one of them and was ignoring to accept the theft.
So guys just for your info PSO has bad reputation as per discussed by people in this forum.