User Activity

I just sold 4 items by auction, all with pickup. Only 2 buyers contacted me and picked up their items, the other 2 no communication and I raised non payment strikes. Q how can I tell when buyers are bidding on my items if they have any strikes agains...
Seller's listing said combined posting discount and advised how much second item would be for postage, upon purchase seller wont honour listing & after complaining reduced postage by 5c
I left a negative feedback for a seller yesterday as the product was not as described but I now find the feedback has disappeared from both oue feedbacks, the seller is still registered. On further investigation I seem to have lost ALL feedback left ...