My partner & I were discussing this today, and unfortunately we haven't come up with a good solution yet...
On a side note, I had no idea about Soy Life yoghurt! It only says 'Vitamin D' on the label & I figured it was safe because it says 'suitable for vegetarians'... But I just read online that it's derived from lanolin - why on earth would they put that in soy yoghurt??
Urgh, I still have a tub in my fridge!
Yup it's f**ked. I only found out just before going vegan and also while I was eating it! I nearly threw up!
With the yogurt - if it's a one-time purchase, then I probably wouldn't say anything. They're obviously trying to be nice, and if they have only bought it once then maybe just take it in stride. If they continue to buy the yogurt then maybe say something then.
I agree, it's lovely that they are really making an effort so I would just leave it, unless it kept happening.