Yes, you can. Some online casinos state it in their terms and conditions. So you’d better be calm and polite when speaking or chatting with support managers. Do not insult, abuse, or offense them in any way. It won’t help you anyway. Otherwise, it can make the situation even worse.
https://casinobest.ca/faq/can-i-get-banned-from-a-casino-for-speaking-rudely-with-the-support-team/