Regardless of his past he sounds legit. All I can say is I agree with Simmons just dont rwt (which I'm sure you wont any more) while in WG. If its that bad for gp do what I do and buy bonds legally, (go ahead and make fun of me I work all day dont have time to grind that much but Im getting slayer etc...) but ya man as far as getting hacked and recovering your account it is a unique case but just move forward. There's a Bible verse of Luke 9:62 that talks about looking forward and not back, check it out if you're interested I think you might like it. And as far as those levels its not your fault you got hacked and you didnt bot those levels either.
Get an Authenticator on your account so you can secure it to you, just my advice. As far as you as a person based on your app you seem like a chill guy that Id be glad to be in the clan with. I hope Osrs is a good place for you to have a hobby and WG is an awesome place to do that hobby