Airbnb No refund san francisco california

I have booked a property in Portugal through Airbnb. Portugese embassy was contacted to confirm whether US citizens would be accepted into the country. The response email stated that US citizens wouldn't be allowed to enter Portugal due to pandemic situations (email proof). Once known, I have contacted Airbnb customer support and they agreed upon being reimbursed in full (i have proof of their acceptance). The refund was made only in the amount of 50%. upon being contacted multiple times, no one responded from Airbnb customer support.

i have filed a dispute charge with my bank (capital one) who provided a temporary credit until the situation would be resolved. I was contacted by the bank the other and told that the charge was valid and I wouldn't be reimbursed. The bank didn't even take the time to request the proof of evidence of my conversation wuth Airbnb