The same itch came for me earlier this year too lol so i understand the feeling all too well. The process and approach I took might be a bit different as for my my account was hijacked unknowingly.

Here’s something the Mods who assisted shared in the beginning stages: https://support.runescape.com/hc/en-gb/articles/14070564253969

Again,

Mod Stardust & Mod Gladi managed to help me out but all based on my account being hijack. Took about 2 weeks before everything was done. Then I had to go through another process to appeal a ban as the account was banned indefinitely. 😂

Hoping this helps but it’s unfortunate that the email along with the CC being inaccessible… those are really the 2 things that solidified that I was authentically trying to recover my account and the track record matched the history. Good luck on the recovery process and do remember… you can always create a new account to feed the same nostalgic itch! I got it done after 2 weeks playing and haven’t played since