Taxi picked up someone else, wont let me cancel

I was watching the taxi through the tracking option, and about 2 blocks from me (so obviously not me) I saw it switch to "in service". All I could do is watch in the tracking map as the cab drove away with someone else to parts unknown. Also, as it was in service I couldnt cancel the taxi, which meant I couldnt order a new taxi. Looks like Im calling a competitor for a ride now because Im sure not walking.

Unkz about Yellow Cab Vancouver, v2.0.21