Freelancer — amount debited without my knowledge

Address:

560100

I've registered in freelancer for job. But I didn't use the app since installed. Today they have been debited 760 from my account. There is no confirmation messages, calls, or emails from them. Now I lost my money by them. Need to be refunded. How could they take my money without my knowledge. They need to clear to this issue as soon as possible. My contact number is [protected]