@Nicole2337
The rules regardng reporting issues with a listing are written here:
What if i need to cancel because of a problem with the listing or host
It clearly mentions you need to act within 24 hours when discovering a issue.
The Airbnb guest refund policy is here:
Airbnb guest refund policy
Please read the above information carefully and check if you have taken the right steps.
If you did take the right steps, then Airbnb IMO should re-open the case..
It is important to have proper evidence of the issues (photo, video), but also have the communication about the issues available between you and the host.
BTW
A cancelled "long term stay" does not refund the next 30 nights after cancellation (as dictated by the special cancellation policy attached). So the host is not obliged to refund. But Airbnb can decide otherwise and force a host to some refund if issues are severe and correctly reported.
And you can also report the listing to Airbnb (using the report flag)