One97 Communications — Giving OTP in another mobile no. for fraudulent withdrawal of money

I lodged a complaint with BSNL for my [protected], but as now realised, I could not understand that immediately how a phone call was received by me from [protected] saying as from BSNL and they will refund the amount of 50/- apprx deducted but to your bank account or paytm wallet.
I gave them my paytm mobil no.[protected] and they asked me to tell them OTP received in the mobile. I showed my unability to see the OTP while I am talking on the phone. They asked me for another mobil no. and i gave as [protected], they made call me at this number and asked for OTP, but by the time it has been timed out.
Thereafter they made call at my BSNL and informed of OTP received at my [protected]. The OTP received at this was 751727 which I informed them and now I see that my paytm mobile [protected] shows a Zero balance.

How Paytm issued OTP to [protected] against my paytm account at mobile [protected] ?
My pass book at mobil [protected] shows :-
Paid for order
CC AvenueNew Order #[protected]
Rs. 500.00
^ May 31, 13.54

Wallet Balance Rs. 0.00

This totally seems a fraud case.

Please see how OTP goes to [protected] ?