JustDial.com — Sir my registered mobile no. Change

Address:

Awdhutwadi Yavatmal

A person call me and said that i am from just dial if you want to change registered mobile number kindly give you alternate number. I have given my alternate number. He said me that to change the number an otp will generate and give it to us we will change. He didn't ask me any other details such as bank etc. If he try to he will caught as fraud. He just ask me mobile no. But now when i saw my number for my agency which is registered for free in just dial app that person added his personal number from which i got call. I am not getting his intention. Please change number immediately. Please find out what is happening