Uber Driver Stole My Cash

I'm not very happy about the turn of events concerning my wallet. The driver did leave it at Uber offices, however... he took all the cash, R400 I had in my wallet. He told the Uber people in the offices that there was only R3 in the wallet, but when I spoke to him, he says he never opened the wallet. Question is how did he know did he know about the R3. Which means for that ride I paid the driver R477 hence he helped himself with my cash. It is very ********* and unprofessional for your drivers to ***** from the clients. The money he stole from me was for my transport. I would like you to rectify this matter.