Paytm Mobile Solutions — fake call using name of paytm

Today I receive msg like below

Congrats you have won 1st prize maruti k10 in 3th anniversary day this is valid for today for registration rs4999 contact us:[protected].

This type of msg came from paytm so i paid money to that person

I was click on link directly open paytm app and person name showing Sanket Satish Dodal

So i thought this is certified so i paid money 4999.
Then after this got call to pay gst amount 28000/- and you get car and he gave me below account details

Them account details
Name: kameshwar rao
A/c: [protected]
Sbin0002992

But it was fraud when i call to paytm customer care

If that merchant was fraud so why he got merchant certificate from paytm

Please help me in this case i want to get my money back