Spar selling goods already passed used by date

I really like shopping at Spar nearby to me . The staff are super friendly & when I need something it’s always available. On two occasions I bought bacon which was on special but realised when I got home that it wasn’t marked down on my receipt , I let it slide. A week ago I bought the spar plain yoghurt & when I used the following morning with my muesli it was fine . Yesterday I used the same yoghurt within the same tray I bought and it was off . I looked at the tray and saw that it had expired. And strangely the two tubs I have are expiring on different dates but are all attached !! The one tub says use by 18/08/2021 F4 10:04 & the other 16/08/2022 f4 10:06 . I’ve since had a runny tummy throughout the time I’ve started eating it not realizing it was off & at the time I thought it was just my tummy acting up . Spar is a community orientated shop with the best offers but pls check what u sell to customers