As someone who has seen and understands both sides of a situation like this one has to have sympathy for all. On the one had it is simple (and indeed fair enough) to say well thats unfair no deposits should have been taken when the company was in trouble. But on the other hand the truth is the moment it is public that your company is struggling is the moment that the company goes under anyway. Experience would tell you that in most circumstances of liquidation there are efforts and negotiations to save the company until the 11th hour and it often comes very close to saving before it goes bust. It is for that reason that these things happen as they do. It is unfortunate but equally that is life.
I know nothing about Langans so I am not speaking in a specific nature there, but the issues the customers of Langans are experiencing arise in most retail liquidations, especially when it is furniture shops. Anyone with any sense will pay their deposit on a credit card, which is insured.