You can not contact them. No working email or phone.

dude this is NONofficial osclass market. SO do NOT use it! or any non official osclass or dev market. As like osclasspoint if you like someones product find the developers original store to buy products.
Even when osclass.org was alive until last year I never bought anything from them, neither for me or my clients. Everything that was bought was from the original sources - developers own e-shops.