I'm just thinking of making something like a Ganodermics bot of it, and it's not worth the investment if you're looking for such a high price. I'd rather do it myself in that case.
I'd suggest saying that you'd be fine with a rollback, because 'you don't want an account with stats you haven't worked for' or something else to convince them you didn't bot on your account
One of my friends got hacked for his bank and yellow phat, even though he had authenticator, pin and shit.
Run the virusscan, check for keyloggers, everything.
It's likely something like that. But still, sorry for your loss.
You can talk freely about other bot clients here, because we know RuneMate is superior. Join Slack if you need a chat, some help or soms memes from @Gengsta or @Savior ;)