I feel your pain! My DS flat out refuses as well. I have tried different bottles (even bought an Adiri one that is supposed to be like a boob, cost $25), sippy cups, straw cups, normal cups...nothing has worked...he just wants boob!!
I left him with a baby sitter last week and ended up getting a phone call to come home, Jack screamed for over an hour and just would not drink from the bottle. As soon as I got home he fed fine from the boob.
Jack drank fine from a bottle a few times when he was a few weeks old, but I dont think he will do it again!
Sorry that I haven't been any help, just want you to know you are not alone.

By the way, I have a freezer full of EBM if anyone wants it, LOL.