There are a couple of ways you can contact the casino. The most common one is through Live Chat which is available 24/7. Another way to contact the casino is by using their phone lines.
This is the number you can reach them if you are a resident of the UK: 0800-755-5348 and for international players: 00356-277-80065. If you want to send a formal complaint you can do that on the following email: email@example.com and for other queries firstname.lastname@example.org.