erex.io is delisting Billiecoin. They are actually delisting coins with no activity for a week.
So please withdraw your coins from erex.io before April 10, 2020
It's unfortunate, even though you have tried to list it there, but those who are interested in billie coins are still quiet or erex.io is not very well known by people, so trading is not very active. It seems you need a strong community to help you and also a small exchange that has been knowing by some people.