Online fund transfer my ac karta loan app whithout my permission

Online fund transfer my ac karta loan app whithout my permission
I needed some money so I searched for a loan app and I opened a loan app or asked me to enter some details of my amount. Or I entered but I did not have that amount.I didn’t want to go through any further process but Karta loan app put 1800 rs in my account without asking or I didn’t get any message about the amount but when I changed my account on 24th day what did it give me 1800 .They put it in my I don’t know from which app those 1800 rupees came.

Online fund transfer my ac karta loan app whithout my permission