Inefficiency at Audio House

Why can't Audio House implement a cash and carry system for its
products?
Curently, I have to queue to pay up, then join another queue to
collect the items!! Some crap reason about stamping the warrenty card.
Then when I reached the collection counter, they took another few
minutes to find the items i bought. Queued for more than 20 mins
altogether to pay and collect 2 hairdryers.