Wow Momo — Refund

On 6th July 20, i have visited wow momos outlet in pacific mall subhash nagar, wherein i have ordered for veg panfried momos with dip that cost me around Rs.124/-. however instead of Rs.124/- mistakenly they deducted Rs.261/- from my debit card.
As per the outlet person he said make another payment for Rs.124/- seperately and we will refund the first payment of rs.261/- as they void my first bill. And they promised that i will get my refund within 24 hours. But its been 5days now. I didnt received my refund yet.
and i tried to call them but they are misbehaving on call and saying that i didnt made any payment of Rs.261/-.
This is pathatic service. Never expected this kind of behavior by a reputable firm like WOW MOMOS