I've had a problem with my local Iceland store for a long time. They have price labels saying for example buy 3 for £10.00 and save £1.25.
But when you get to the till you pay £11.25.
On at least two occasions the person on the till has given me the receipt and I've seen I have been overcharged and then time is spent giving me a refund.
I went in this morning and saw a £4.00 for 2 offer and the saving was £1.50.
It was busy so I didn't have time to check my receipt but outside I noticed I had been charged £5.50.

I had to go back in and the manager is very arrogant and when I told her they should sort out their prices, immediately as I walked away I heard her laugh. I turned my head round and she and a colleague were laughing. No respect for customers.