Was the proxy private? Possible (but uncommon) if the proxy was public, it clashed with someone else who also used it, and blatantly cheated.
Sad to say, but you really own nothing on the site. When you get iced and if you're lucky enough to get a dick reply from TNT, they'll even refer to the TOS. They can come and take whatever you've worked for over the years without regard, then go home and live their merry fuckin' lives. It doesn't matter if you were legit or not, the risk is perpetual; every click you make on the site can do you in.
I'll go so far to say that if they weren't such little shits, sites like cK probably wouldn't exist.
In searching forums in the past, here at cK, I forgot who said it, but once said something like, "It's not whether you get iced or not, but how long until you are" - 100% true
My first, and 100% legit main I've had for 9 years, built up 200-300m, and had odd items you don't see in the TP for months. One day out of the blue they just iced me on the BS reason I tried to scam someone. In an attempt to protect my account, I had the habit of saving important neomails, big trades, and only deleting messages when maxed - to give TNT proof. They didn't care, probably didn't even care to look. Lazy fuckers hit the ice key and it was over for me. I sent in tickets, twice they told me nothing and were just spam pastes, and ignored my last ticket for almost a year now, when I can see they have been accessing it periodically. It's how they reward longtime, legitimate players.
Well, fuck that shit. Here I am, TNT can choke on my dick; I just bought 5 years worth of work back in a few minutes. And if I get iced, I'll just do it again. Cheers, cK!