Swiggy — Taken the whole amount again by the delivery boy

Address: Smack residency, chemmancherry, chennai

I had ordered 20 items through swiggy instamart on 16th September which was a total amount of 2000 ₹, order id [protected].
But the delivery boy took 2000₹cash too from me as it was my first time and I got confused.
I want my extra 2000 ₹ back.