account mysteriously deleted?

hi! i got on tiktok this morning and it wasn’t letting me save any videos. when i cleared the app and reopened it, it said my account does not exist. i’ve had this account since 2015 so obviously it’s very sad. i got a text a few hours ago from “tiktok” in russian. was i hacked? :( and if so, has anyone else experienced this/was able to fix it? thank you!