Tell them to talk directly to your attorney. If you receive mail from them, forward it to your attorney immediately. DON'T forget to consider saving some of your credit cards. If any of your credit cards have zero balances, you may be able to keep them. Some card providers may ask you to reaffirm your debt in return for keeping a card, and this is worth considering, especially if there is a small balance.
Life can be a lot harder without a credit card.
DON'T keep a creditor off your petition for any reason. If you intend to pay them back, you can anyway. DON'T run up a lot of bills immediately before you file. If you max out your credit cards or take out a loan before you file, the court could find your petition to be fraudulent and dismiss it, or except those debts from discharge. DON'T unnecessarily spread the news that you have filed for bankruptcy.