According to the response you and the others received, it would appear the first option offered was a refund. Then you were given the option of upgrading because they were out of stock. Doesn't look like a scam to me. I think you have jumped to conclusions and it does not give you the right...
If you aren't feeling better by tomorrow, or show additional swelling, you may want to give your dentist a call. I've never had pain days after a root canal and I've had several; including an eye tooth. There could be infection setting in and a round of antibiotics might be in order.
I usually steer away from any concentrate that has 'Cheese' in it. I find they usually have a 'barfy' smell and taste to them. Not this one... don't know why. But it's just delightful... smooth, almost a floral after taste.