Dont book your flights with Booking.com

When booking a recent flight to Croatia from Prague I noticed that I could book my flight ticket through booking.com. This was a grave error. About a week before the flight was set to depart, I was contacted by booking.com to say that they could not honour my return tickets date. They gave me one other possible day which was a day earlier than I was supposed to be returning. This did not work out for me and they said that they had no other option for me. They did say that I would get a full refund for my ticket. So I cancelled the ticket and rebooked on another flight. I was told that I would receive my funds in my bank account within 10 to 14 working days. The funds were supposed to be deposited back into my account 14 days after the cancellation. Up until now which is the 18th of November I've still not received anything from booking.com (over a month later). And after enquiring when I will receive it they have now changed the tune to tell me that: they are unable to provide me with an exact refund timeline. I originally cancelled this ticket around the 10th of October.