Yeah, it’s a technically difficult problem to deal with because you’re probably often sharing an IP address or a block of IPs with bad actors. You can’t really share details about it without giving them a hand.
I guess cynically said, you could probably go through their VPN service to fix it, I’ve seen that from time to time.
Assuming you mean texting style acronyms, yeah, we have them in German and I’d assume in other languages too.
Alongside the stuff borrowed from English 1:1, there’s stuff like bb for “Bis bald” (See you soon) or hdl for “hab dich lieb” (Love you)
I’d assume other languages do the same out of efficiency or laziness.