Today while coming back to home from college, a group of ladies, say 3 wearing white coat asked me for my phone and told me that they want to call someone urgently. I gave my phone. They called 1800120170170 from my phone, after one minute I got an otp message. They noted the otp and gave me back my phone. When I googled, this thing seems fraud.. what should I do?. This happened in Bangalore.. is there any safety precautions I must take?