Horrible flimsy tomee tipee teets

Tomee tipee bottles I bought tomee tipee bottles I really didn't care about colour etc... I just needed more bottles and the number 2 teet couldn't find it anywhere eventually found a set at the pharmacy and bought it. My little one hate those teets it's very different from the other number 2's i got this one is very very flimsy and keeps pushing in as my little one drinks they are horrible. How come there is difference in number 2 teets? It doesn't make sense.. I really hope for a response from tomee tipee this is unacceptable and I am very unhappy with this.