Kind of reminds me of:
Customer: "But using it, I'm loosing money on every purchase." Vendor: "Don't worry, buy more, you'll make it up on volume."
Customer: "But using it, I'm loosing money on every purchase." Vendor: "Don't worry, buy more, you'll make it up on volume."
I'm the first to say that Facebook Ads don't work for everyone. And in advertising you should immediately stop spending on anything that don't have a positive ROI.
Still before stopping you should learn a bit how to use the platform and give it a fair try.
Then if it does not work ... stop it immediately and move on testing another channel :)