DellStore India no acknowledgment of cancelled order, not answering phone, no info on refund

I placed an order for a Dell monitor yesterday, I assumed it was dell.com but I had been redirected to DellStore India and it was this site where I had made account and placed my order, paying with UPI. This morning upon reviewing my receipt I realised that the shipping address is not my default shipping address, but my billing address which is different. When I checked order status, it said 'Order Processing', so I cancelled the order because dellstore refund policy clearly states that orders not yet shipped can be cancelled. When I cancelled the order, the screen read 'Your Order has been cancelled'. However I received no emails acknowledging that my order has been cancelled. When I login to my dellstore india account and check status, it reads I have not placed any order. I emailed customer support, I called their number 1800 212 1520, to no avail. When I called from the phone number on my order, the call was cut-off immediately without even reaching a pre-recorded menu, but when I called from a different phone number they asked to wait as all their customer care people were busy. I waited holding the phone for several minutes then the call was automatically disconnected. How to get my refund? I had placed the refund request just today, but the lack of communication and difficulty to reach their customer care is making me anxious and suspicious. Please help.