No, I'm believe you that you didn't go into it blindly, but baby Meller's are fairly rare here (it seems like someone only hatches them out about every 2-3 years) so I wouldn't have been surprised if you'd never seen a very small one. It's too late now, but that's also a good reason to suspect someone who says they have CB hatchlings.
So was this an online breeder/vendor? Are you familiar with Faunaclassifieds.com? They have a Board of Inquiry (BOI) where you can post a negative (or positive) review of a breeder or vendor depending on your experience. So if you contact this person and they do not offer to refund your money, return your other veiled, send you a Meller's, etc., whatever it is you would like to resolve the situation, I would post up a thread on them and send them the link to it.
The thread itself may not solve anything (sometimes breeders to save face will correct a situation once it's been made public but not all of them) but at the very least it may help someone else who is thinking about purchasing from the same people. A quick search and your thread would pop up.
Again, I'm sorry someone tried to trick you like this.