Dude... did this kid know the password to your account by any chance and therefore logged in to your account and took it??
The reason I ask is because I met this kid on RS a few days ago and we added each other. Shortly after he PM'd me asking me advice on a question. He wanted to know if he should steal his friends 16M which was sitting in his bank on his account, as he somehow had is password or said his buddy trusted him to go on his account or something like that.
Of course I got very angry with him and he promised that he wasn't going to do it. I haven't really talked to him since then though, and I can't help but somehow think that maybe this is the same kid we are talking about. It could be a total coincidence, but 16M isn't a lot of cash and I find it weird that it was the EXACT amount that he said he was going to scam. He also thought it would not be a big deal because his friend "sometimes buys RS gold" and so he could easily get it back. You are posting this on Sythe.org, a site where people buy/sell gold, which is making me think even more that your the fucking kid he was talking about!!
Please tell me this is just a giant coincidence. I have his RSN and so if you can tell me what it was I will know for sure.
EDIT: I forgot to add that he was very unclear about whether he knew the kid in real life or not. At first he said he didn't, and then he said he did, "sort of". Even though you don't know the guy who scammed you in real life, you said you have his phone number, which means you must SORT of know each other in some way or have talked via phone, texting, Skype or whatever. This is fucking trippy dude I am like convinced you are the kid he scammed!