In a supermarket this morning, buying a few small items at a self service till and it flagged up a call for staff. No one came, so I had a look around to see their staff member basically doing a "one to one" with an old woman and a full shopping basket, who clearly hadn't a clue how to work the self service till. The guy was basically doing it for her. I went over to ask him to come and clear my till call, and he basically told me to wait. So a few minutes later, he was still faffing around with her, and most of the other tills were flashing red and being ignored too, so I just got fed up and walked out leaving the shopping. Surely, if customers aren't capable, they should be using the "manned" tills and not holding up everyone else, and if staff are having to help for so long, they should at least attend to other calls too and come back to the problem customer after they've cleared the calls.