Sorry I didn't posted an update sooner, I got in contact with a veterinary student that has experience hand feeding cockatiels, and she was going to help me, then I spend one hole day getting in touch and talking to the ( I can't say breeder) man who had the chicks, I was finally able to convince him to surrender the chicks, he only agreed for my to pick them up yesterday, unfortunately it was too late for two of them, they die before I got there, and the third one died as soon as I place him in the hands of the vet, but I had the feeling he won't make it, because when I pick him up, he can't lift his head and was just so limp.
The vet told me he was severely malnourish and that even if I have got to him sooner he will have few chances of getting better.
I'm soooo disapointed, I feel I that maybe if this "person" had release the chicks to me sooner they would had a better chance, I still can't belive that he rather let them starve to death that giving someone else the opportunity of saving them.
He even had the nerve to tell me, that if I wanted, he could try to get me another bird, if I hadn't been in such a hurry to get the chick to the vet asap, I would have told him a very big piece of my mind.
But I want to thank everybody for all the advice that you give me, this forum is the only reason I'm not totally dissapointed of human kind.