First off, ouchy on the teeth, I sure hope you feel better. I also hope you were eating the milkshake, not using a straw.
Good for you for taking the time to write them on this. Usually if it was one kind of food, its like "you should just find something else" but when its 3 different kinds, all taken away, it speaks volumes! They need to hear from their target audiences!

The only thing I can suggest is to try to find something else on their menu to "tide you over" until the new products and even then, make sure you know the new product is just a short time only.

Good luck and let us know what they say to you!!