After going into the trouble to visit, read the very extensive list of exclusions and deciding on the order, they notified they they only had available a very small subset of the menu (5 options only) and refused to honour the burpple deal and insisted they had never heard of it

Exact same thing happened to me! I even redeemed the deal but they chose not to acknowledge. Told me to call their boss, whose number was listed on Burpple. I called but no answer.