eDreams complaint: Ticket validity not extended as requested

I was not able to board an Emirates flight that I had booked through GoVoyages (a part of E Dreams) due to a border closure.
Under their COVID-19 Keep Your Ticket policy, Emirates extended the validity of my ticket for three years, promising to allow me to use it on any flight to Europe before April 14th 2023. They asked me to let GoVoyages know that the validity of the ticket needed to be extended on GoVoyages end.
GoVoyages failed to extend the validity of the ticket as requested, even though I spoke to an agent and directly asked them to make sure this was taken care of. Now because of this the airline is refusing to let me use my ticket, saying that it is still valid but that it cannot be opened in their system. They are saying that GoVoyages made an error and that there is nothing that the airline can do.
I am being offered a refund, but flight prices have skyrocketed, so a refund would not cover the cost of a new flight.

I have planned my entire year around this flight and am really angry and upset. Meanwhile, eDreams refused to acknowledge their error when I contacted them.