Step 1 - Appeal the Ban
If possible, change your IP. Once you change your IP, recover your own account. Then, appeal with the following:
Dear Jagex,
I was logging into RuneScape for the first time in a while yesterday and I was surprised to be banned. I have been gone for week participating in a youth mission trip at my local church with a few friends. I realized I had a virus on my computer and had to use MalwareBytes to remove it. I am not good with viruses, but I believe it was one that logs keystrokes. My account has been hacked and I would like to get it back.
Sincerely,
"your rsn"
Step 2 - If 1 doesn't work
Go to your email and send an email to parents@jagex.com
Hello Jagex,
I know this e-mail address is for parents only but there is no other way to contact you about my issue. I have recently recovered my account only to find out it has been banned for macroing. I have been gone for over a week at a youth mission at my local church and I came back to find myself with a virus that logs keystrokes. They got my skype and rs account. I am now secure. I noticed I'm banned and I'd like this to be reversed.
Thank you for reading this.
Best regards
(your name)
Step 3 - If 2 doesn't work
Change your email and IP and send another email to Jagex:
Dear Jagex,
My child's account was banned for macroing. As he explains it, it's people who use automated services to benefit in the game. I've heard him mention how he hated these people before. I myself play MMORPG games and can't imagine how there could even be an automated service. I have scanned my son's PC and browsing history and can assure you he has no downloads or history on any 3rd party runescape website other than RS Wikia.
I'm hoping he can get his account back.
Best regards,
A concerned parent