Invalid tf2wh ban

i been banned for no reason (unless trying to use a gift card/credit card on steam to add $10 to my steam account) i saw others have the same problem and also though it is not related to steam but can not log into minecraft now, im just annoyed how i got banned for trying to use tf2wh effectively to help trade with people who need certain items like i got a guy brown paint when he was looking for which i got of of tf2wh which if it is bad to do that then im sorry. just note i like tf2 wh because it is a easy way to get items through tradings tuff for credits and bypass people who just want keys,ref, or other stuff like that for items which i get annoyed at plus get good items.