Food Panda — amount not refunded

I had ordered food through foodbpanda app. The order got cancelled and they told it will b refunded within 7-8 working days.
I haven't received my refund yet and it's been a month now. It's very disappointing to see them being irresponsible towards this issue. I had dropped several mails and there is no contact number available in the website.
Hoping that you will resolve this as soon as possible.