Injured Junior Blackbird

Hi,

I’m wondering if anybody can shed some light as I have phoned the rspb but just get passed onto another trust which doesn’t want to know, I have an injured junior blackbird that obviously has something wrong with its wing as it cant fly, I have been feeding it and giving it water but the poor thing looks in some pain and I don't know know what to do next or how to get it the help it needs.

Thank you.