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Make sure you pay them off before the 0% expires, as if you wait any longer they will charge you interest from day 1.
That's strange. I just called in two weeks ago. I was going through the automated system when it flaked out and sent me to a rep. They took the info, I requested $5,000 and they approved an increase from $1,7000 to $5,000. Painless. Keep at it, you'll get there.