Ok this is going to be a short thread but will show the best way to keep your scammed gold.
Way #1: Guild banks.
Ok this in my opinion is the best way to keep your gold, its virtually untraceable as long you are not reported.
1. Invite scammed character to either A. new guild you made B. guild you are in that you have officer status in.
2. Once scammed character is in guild have him put the gold in guild bank.
3. withdraw the gold from guild bank.
so now you have the gold on your main chars account. I suggest leaving the guild on the scammed character or just deleting the scammed character all together.
Way #2: Pretty well known. the AH.
1. Put an item on the AH on your main account (Put it up for however much gold is on the scammed account)
2. Purchase the auction on the scammed account.
Now once again I suggest getting rid of the scammed character.
I know its well known but the guild bank way isnt used much and I see this question being asked alot.