This is my first reservation using booking.com and I must say I am not impressed. The website leads you to believe you can change reservation at any time. Also the term non-refundable has meaning it means you cannot cancel and request a refund. I inadvertently made a reservation for the wrong date and attempted to corrected it immediately after it was noticed.
You folks keep blaming each other property owner and booking.com for not being able to resolve this problem. When I call the property owner they say bookings.com wont let them change date. When I contact bookings.com they say the property owner must agree. The website says that this reservation can be changed at any time but is non-refundable but that is not was is being requested I am not seeking to cancel only change date and pay any upgrade for that change.