Ola Cabs / Ani Technologies — attitude of the driver

Sushant the driver of the ola cab no. 3340 has suddenly canceled the trip after i boarded the cab. I have booked the cab from c. R avenue to sarada pally (Raja rammohan roy road). He suddenly said that he has some other work to do. I am so much surprised at his behaviour that i forgot to take a screenshot of the booking also. And he canceled the tri but ola app is showing me the deduction of rs. 50 from my next trip which he confirmed that no fine would be taken from me as the cancelation was from his side. And this type of the driver has a rating of 4.4. Plz take into action immediately. Thanks.