I haven't played in a year. Discovered they added osrs on phone. Thought it would be fun to play, and find my account was banned two months ago. I probably got hacked at some point, and have no idea how to contact support. There website has a support ticket, but I cant find a way to actually contact them.
Shiba's second link takes you to the Support Centre. Searching something like 'ban' would have sent you to this page: https://support.runescape.com/hc/en-gb/articles/115002238729-Account-Bans.
At the bottom you're able to appeal the ban. If you were hijacked at the time of the ban then you'll be unbanned!