So I get this message from paytm

{ Dear sir Congratulation You are product order PAYTMMALL online shopping At home shopping tv show Your name to open the luky drw TATA SAFARI 1260000 The charge of your REGISTRATION service charge pay This is valid for today please call 7033284658}

Which was a fraud one.After I call them they even gave me an account number (STATE BANK OF INDIA NAME:->SURENDRA KUMAR VERMA A/C:->37176937914 IFSC:->SBIN0004646 7352412409 paytm) and told me transfer 6500Rs and then they will transfer 125000Rs to the bank account which I will send and also gave me some other crap when I tried to ask for legal Paper. I knew it was a fraud call also truecaller showed 34 spam repoarts so all this did no harm but still how did they get my number.please explain this to me I want to know.