Remember, when you use the platform you completely trust them and therefore members of this forum will not be able to help you if your currencies disappear, "only the support team can."
So try to use the well-known and reputable platforms so we can help you influence their reputation "they will worry a lot for fear of losing it."
what is the platform and is it error by you or by them?
I was using a platform called Changenow. While putting the memo I gave two leading and trailing spaces so my order was not detected. When I reached out to them they told it is their policy if you will put the correct memo also it will not detect if you will give space.