bigboihill - keep yoru paid off letter in hand.  Does it specifically reference the Barclays cc account ending in xxxx?    Most underwriters can make the logic leap from your letter from ARS to Barclays chargeoff being paid.

As for Barclays, don't poke them unless you have to.   If you absolutely NEED to - underwriter says so - then you can maybe do a 3 way call and get verbal confirmation of the debt paid off.  Barclays is slow to update to the credit bureaus in my experience.