CVS review: in-store coupon ($15.00) for completing a 30-minute online survey

I was not given credit for the full value of my In-store coupon ( It was a reward code for doing an online survey ). What happened was they should have rung this up as 2 seperate transactions. I was buying food with my EBT card and also some non-food items using the $15.00 In-store coupon. The cashier insisted on ringing it up as one transaction, which ended up shorting me $2.63 on the value of the In-store coupon. If she had rung the food up in a separate transaction, then the In-store coupon would have paid for all the non-food items. But she insisted on ringing everything up in one long transaction, which left me short $2.63, and having to pay for that out-of-pocket.

They should have rung up the food separately from the other items from the beginning. And the store manager refused to correct the mistake.