PNB MetLife — Want to refund my premium amount.

Two days ago, One person called me and informed me that: "My old premium plan is discontinued and if I want to get benefit then I must have to do settlement like Pay 50, 000 new premium and then after 30/35 days I can get those benefit. So I trust that person and purchased new plan "Guaranteed income plan" 50, 000 yesterday."

I paid for plan so one verification call came today and they told me that There is no premium for settlement, so they told me to contact you.

So how can I refund my payment.