In Asda yesterday spent £80 odd on groceries. Didn't know pin no. which I told cashier ( I usually sign it). She said pin was blocked and I coulndn't use card. Didn't und erstand as it has been doing this for about a month and I can still use it. Asked for another form of payment which I didn't have. Manager refused to override it and said I could stand there all day if I wanted to. Ended up in tears with my 2 dds sitting in trolley. Then said they would phone bank and returned to say they are retaining my card. Phoned bank when I got home, who say they had no right to keep my card.