I've had good look with writing directly to the CCC, did not even attempt a phone call. I wrote to citicard to request that they remove some old derogs in view of my current good standing and they were as good as gold and removed them on all three CRA's. I also wrote to Best Buy/Household, but this was more of a polite dispute, I requested that they send me details of the account history for verification - they wrote back and said they would delete the account. I suspect they had lost all the account documentation and decided to just forget about it.
I used the addresses provided on the credit report where available, if not then find a good current address through google and add "Dispute Processing" or something like that.
