Company shuts down owing us money

This company is a division of Caxton CTPrinters. It is a magazine distributor where we have been subscribing to a particular magazine for a long time, Suddenly out of the blue we receive an email from them saying that they are shutting down and will no longer be distributing our magazine. Never mind the fact that wee have just recently renewed the subscription paid in advance. What about a refund? They sent us a form to complete which we returned beginning of June 2020 but no sign of a refund!!!!