Need suggestions

My team lead told me you have good understanding of technical knowledge & you are very dedicated about your task . & TL make me point of contact for my team , after this I am responsible for doing all necessary work provided by the other team . Problem is other team call after office hours & weekend also , my TL didn't reply my msg & received my call . & When I asked to my team members for work , they simply deny me . It's like I am only responsible for doing all of my team work . I feel depressed. What I do ?