Better to stop doing business, or they’ll never learn.
On a related? note, local area code + 867-5309 seems to work for most store discount cards.
Safeway no longer accepts that number at least in the 503 area code, I found out upon trying as was my custom, a few years ago. The cashier recognized it and laughed with me as she scanned her own card which they keep on hand precisely for these reasons, as I understand it.
Actually, I did have trouble at Safeway with this recently but the cashier kindly gave me a card that scans -- very nice because it has none of my information associated with it.
Related, but when I am forced to read the number instead of just typing it in, I consciously say "Eight Six Seven Five Three Zero Nine" instead of "Oh"!
When they ask for email address, I give them postmaster@hashbang.com