This is utterly ridiculous, me and the G/f went to do a weeks shopping in Biedronka of all places (we've been relegated from Auchan since the maluch caught fire :( ) thought that i'd pay for it on card as most normal people do only to be told that they don't accept cards,
I'm sorry to hear about your maluch. As for Biedronka, I guess that their target are the low-income customers so maybe they think that they do not have to strive for perfection? :)
From my experience most supermarkets do allow their customers to pay by card. The two exceptions tha I know about being Biedronka and Netto.