they cant do it, not wont. not possible. gotta choose 1 or the other.
It is possible for it to happen. There have been times where I used a 20 coupon, and then the items went on sale and a coupon code came out. I asked them to adjust the price plus the coupon, and they did. When they adjust it, that will adjust the price, and then the original coupon will be stacked. Or, the items were on sale, I used a 20%, and then when the coupon came out I had them adjust it. It is possible for them to do it. But if you ask them to do it in their system to stack them, then they won't agree to do it.
thats if you get a clueless rep. but theyre not supposed to do it, cuz youre not supposed to be able to do it.