Breastfed baby prefers bottle

I’ve pumped since baby was 10 days old to help my supply because he wasn’t gaining. Over the last two months he’s rejected breast on and off. Now he won’t latch at all, ever, it’s been a few weeks and he hasn’t nursed once and only wants pumped milk from a bottle.

Any advice on getting him off the bottle and back on the breast?

I do have a low supply still. I only pump about 700mls a day so he has 1-2 formula bottles, usually at night.