Puma — Shoes not received, need refund for the same

I ordered shoes for my father from Puma's official site. And my parcel got stolen by *DELHIVERY* agent, but very smartly they marked it as delivered on the tracking site on 7th December(my father's birth date). It spoiled my dad's day as all o[censored]s got worried.
Since then I'm consistently trying to get refund but they are just delaying it.
Kindly provide me the money and take action against your delivery agents. Also, stop fooling people.