PATHETIC CLIENT SERVICE FROM BOOKING.COM

I have made a booking via booking.com in January at a hotel in Las Vegas which I made a mistake on the dates. The initial booking was unfortunately a non-refundable booking. After a lengthy email trail they told me that they are willing to waive the non-refundable waiver, if I make ANOTHER BOOKING with the correct dates. this now means I have 2 active bookings for the same hotel at just over R 60 000 in total (around USD 1020) They ASSURED ME that I would have the refund within 7 - 10 working days, that was in January. IT IS NOW MIDDLE MARC AND STILL NO REFUND!! Plus my previous booking is cancelled but still paid for!! I have been sent from pillar to post via their chat portal and nothing comes of it. I think this is utterly ******** of a big company!!