Baby rejecting bottle

My baby is two months old and is rejecting bottle (breast milk not enough have to supplement with formula). We tried four brands of bottle, change the teats for faster flow, change people who do the feeding, checked temperature, feed at same place, even starve her a few hours, but she still stubbornly rejecting bottle. We put the breast milk into the bottle and fail as well, so it’s not the formula that matters. Any mummy experienced this and any advice?