I'm going to say this needs to be taken further than the manager. Contact Sainsburys and tell them the time and place. That way they can either support the manager in his endeavours or chase him up if he's failing to deal with the problem. But it's Sainsbury's itself who needs to know, not just the manager.
What’s a household item that reminds you of your grandma’s house?
MAKE A SENTENCE GAME [FEB '26]


