Hey - @Maldesto is the only person who can help ya out here. If you already submitted a refund request (https://osbot.org/forum/forum/210-refunds-appeals/), you'll just have to wait a bit. It could take a week or two depending on how busy he is.
Jagex bans heavily for small pp energy (such as using @Malcolm or @ProjectPact scripts). Honestly that's why I only use Naked Scripts, as they're that big pp energy that Jagex can't touch.
Check if your credentials were involved in a data breach https://haveibeenpwned.com/
Otherwise I'd be concerned you got phished in some way. The client is safe.