Were any of the CAs trying to collect on accounts included in the bankruptcy? Were the accounts old and beyond the SOL? If so, then yeah a C&D would work. However, as I said, if one isn't out from under the SOL, then a C&D all but assures they'll sue, if they can.
Did you C&D Best Buy? If so, then they aren't going to contact you. Cuts off communication, and that can be your friend. If you can catch 'em in violations of FCRA, or FDCPA in the case of collectors, then you gain leverage to threat a lawsuit to get a deletion.
Message deleted as it violates the FICO Forums User Guidelines:
FICO Forums is intended to provide helpful and useful tips for managing credit and understanding FICO scoring. This is not the place to exchange credit repair advice that encourages consumers to provide untrue or misleading information to a credit bureau or lender for the purpose of raising FICO scores or otherwise improving credit ratings, credit histories or credit records. Such material may be edited or removed, and egregious or repeat offenders will be banned from future participation in FICO Forums.
Thanks for contributing to the Forums. -Barry