No, they have it right, after 28 days the order goes: repair, replacement, refund. unless a repair or replacement is going to inconvenience the customer by an "unacceptable amount", exactly who decides whats unacceptable is anyones guess. We tried to return a DVD recorder to Argos the other day as it has started having trouble, but they insisted that they would only repair or replace, Jay rang trading standards and they confirmed Argos were right
As for Dabs, they are crap, I try not to deal with them now, if something goes wrong you have to send it back to them so they can test it and then they will refund you the amount, then you have to buy it again (and pay a second lot of postage

)