Btdt, hugs mama! So frustrating!
I would keep trying different bottles. We tried EVERY bottle under the sun and DD finally took... The $1.50 gerber bottles that look like they are from 1953.
Definitely try hot, warm, room temp. You never know. Also when are you trying? If LO is frantically hungry they are more likely to get frustrated and reject it. Can you try a bottle maybe 1 hour after bf?
Hang in there mama!
'ing with DH since 05/05
DD 01/11 and two long doggies