One problem of the ecash system . - on two occasions Ive been to the bar , bought 4 pints and given cups back , but been charged for the cups again .. only noticed because in the nano second you get to read the amount left on the card , the mental calculation says you have been charged about £24 for 4 beers .
Getting cash back then is a drama ,( because they haven't got any ) , they cant credit back to your ecard so you have to wait for the bar manager to get you the £4 while you stand at the end of the bar , like you are in the naughty corner .
I appreciate it should be normal to ask how much you are being charged before giving your card , but Ive seen plenty like me that don't and just put the Membership Card on the machine -I would urge you to ask them to confirm how much they are charging before you pay.
I don't believe their is anything underhand going on , it is simply down to lack of training and understanding of the tills and the system