Just fly.com Canceled the return flight but won’t refund the original flight

I booked a round trip flight on TAP air with JustFly.com from NYC to Italy in October 2019. Due to Covid happening and all the changes in airline policies, TAP canceled my return flight, but not my original flight... essentially turning my round trip flight into a one way. When I called JustFly to ask about it, they said their system sees this booking as two separate bookings (which it isn't, I have one confirmation number, booked the trip in one session and one charge on my credit card).

I ask for a supervisor but they say "Due to Covid all supervisors are workin offline", I ask what that means and how can I escalate this issue, and they literally said "you can't.". I must have called 20 times over the past 3 weeks hoping to speak to someone that can help but just keep getting the run around. As of now I have a one way flight to Italy booked, with no return. I don't know what else I can do?!?