Booking.com Flight Cancellation- Refund Request

I booked a flight from London Heathrow to Dubai through Booking.com for 10 May, under the booking reference X7OR8P. The flight was cancelled, and despite this I have not received the support or refund I am entitled to. After the cancellation, I contacted Booking.com customer support, but they did not provide any effective help or a clear solution. I want to receive a full refund for this cancelled flight, yet so far my request has not been handled properly, even though I have received communication about the cancellation itself. I kindly request that my case be reviewed urgently and that the full refund for my cancelled Heathrow–Dubai flight on 10 May, under reference X7OR8P, be processed without any further delay.