Lazypay - harassing for payment for transactions not done by me

I am getting calls and messages from lazypay from *st August **** repeatedly onwards for the amount ****.** for transactions not done by me. I had never downloaded, nor installed the application called lazypay. So, there was no chance of sharing OTP with anyone. I was not even aware of the app called lazypay and it's concepts. when confronted , all they are saying is that a person named Aman Singh has used my mobile no ********** ( my mobile number) and availed loan of rupees **** rupees. I sent a mail to lazypay customer care for which they replied and asked me to write from the registered email. I replied saying that I hadn't registered before atll and that only after this incidence i downloaded and registered to know about fraud transactions. Customer care is replying the same -asking me to reply from registered email. I am being called and harassed hundreds of times daily. Lazypay should stop calling for payment and they should pay compensation for the harassment caused to me
Mobile no. **********
My name : Dr Yogeesh H R
person who has supposedly made transactions using my mobile : Mr Aman Singh
Amount I am being asked to repay ****.**