As mentioned by @snwlprd.eth, your tokens were transferred out. However, it happened after you sent that small amount (i.e., it was not after you sent 339 CORE). Seems like you contacted some people in this regard.
Have you shared your Secret Recovery Phrase or Private keys with any one or have you entered them on a site after not receiving your funds?
Anyway, seems like your wallet has been compromised. Please refer to the following post: