Dunkin' Donuts

I went to buy coffee which was on sale 4 for $ 19.95 or 98, but under $20. There were 6 packages of dark roast on the shelf. When I went to pay, they insisted I could have 4 for the under $20 price, but that I had to pay $8.99 per bag for the additional 2 bags. Any other place would have charged me the sale price x 6 bags. Since many people don't do math in their heads, Dunkin Donuts is taking gross advantage of the public. BEWARE!!