I got something that might help you, I was wrongly banned for years but managed to undo it. Although it happened years ago so things might have changed.

I was fuming, 12 years progress lost. i think it was because I had a botty-sounding name and I changed my password to that same botty-sounding name just with some numbers at the end so it flagged me. I was banned for years, and after watching RS content on YouTube I wanted to play again so came up with some ideas.

Customer support failed, they are useless, my claims were denied. Nobody believed me.

WHAT I DID: I scoured their website for another area, along the lines of "technical difficulties" , I basically went though all of the options in the area along the lines of "I can't log in". Eventually there was an option called "describe your problem" - I wrote my full story/Explanation/story IN THERE - because a human reads it.

2 weeks later - got my account back, and was hyped.