~ so I did not use address from WEX account but I just sent transaction back to 1Ltob7Pm2J6xyGteXpTjmSaBf1ph75LrEK. You know, in normal bank your account is still your account..
Bitcoin is electronic cash. What you did, is like (anonymously) putting your money back in the bank's cash register, instead of depositing it into your account.In this case, it looks like the exchange's address, which they use to consolidate other transactions to, then use it to pay withdrawals. Normally they use each address only once. (1Ltob7Pm2J6xyGteXpTjmSaBf1ph75LrEK was used twice because of your deposit back to that address.
I just received message from WEX support that this address 1Ltob7Pm2J6xyGteXpTjmSaBf1ph75LrEK is not their address....
I find this highly unlikely. I suggest to ask them to check again, they might have only checked customer's deposit addresses. If your initial withdrawal came from them, they must own that address. 
