Theft or legitimate compensation? Driver stopped at the back of the building I intend to go. When I told him that he became aggressive but calmed himself down shortly after (It's was an instantaneous reaction, seems to be not having a good day/ have a temper). We drove around and got to the place and said our farewells. 

A few minutes later after getting off, I've realised that I left my wallet at the backseat and called him back immediately. He arrived back to the place 10mins later and returned my wallet, but when I check, I was $100 short of what I had. I knew beforehand how much I had because I had to pay cash to where I intend to go and I brought enough.

Ride cost - $18 AUD,
Returning a lost item - $20,
Additional loss - $100