The 100ml tube is a NEW product, in addition to the 250ml bottle. It is also cheaper.
I find it a shame actually that this thread is here - Gaia make products that many mums (including me) love, and is run by a mum herself who started making products in her own kitchen and has now built up a successful company which even exports. I can't see how she or the company have done anything wrong by introducing a new product - yes it's smaller but it is also cheaper so the wool isn't being pulled over anyone's eyes.
It sounds to me like the retailer put the new tube on the shelf incorrectly with the bigger bottle price.
This really just seems to be a misunderstanding, but I have to say that I hope none of our own BB WAHMs ever have their businesses affected by false allegations :(