Rabbit wont eat veggies or hay

Hi ladies, i just need some advice and help with my newly adopted rabbit. Its been 4 days since we adopted him and he was refusing to eat in the beginning so we took him to the vet and were given critical care and told to syringe feed 6 times daily. We have done this everyday since however my bunny still refuses to eat greens and hay.... the only thing he is eating pellets and water. I have tried different greens and veggies but he wil simply not touch them. He is alsp very skiddish and not affectionate.

Is there anything else i can do?