Without knowing your dates of travel difficult to comment @Patrick3670
However when you went to cancel it would have clearly shown you what the cancellation fee was and whether you would be refunded anything.
if as you say you only paid 50 % of the cost and you cancelled with a host that has a strict cancellation policy you are probably not entitled to a refund .
look at it this way as an example
total cost = 100
deposit paid = 50
balance due - 50
you will not be charged the balance due as you cancelled.
if you had paid in full you would have been entitled to to a 50% refund . You didn't so no refund due 😀