I apologize if this sounds like a "silly question" - but it is not: Have you contacted your attorney about this? I am concerned about the position they took on this matter, while it is not unreasonable to be aggressive when dealing with creditors (that is part of why you hire a bankruptcy attorney - so that you can get the greatest possible benefit from your bankruptcy discharge) - I am not sure that I fully understand the "don't worry about it" stance that your attorney gave you.
I would recommend first that you contact your lawyer, provide them with any documentation you have from the creditor regarding this matter, and allow him to follow up.
If the attorney is confident in his position (again it is not unreasonable to be aggressive here, and I am certainly not saying he is wrong - I don't have any of your bankruptcy file or correspondence to look at), he will simply fire off a letter threatening the creditor with a "violation of bankruptcy code" demand letter and you shouldn't hear anything further from them.
If your attorney needs to revise his position, he should explain that to you - i.e. what changed, what needs to be done now, and what your options are at this point. But this really requires a review of your documentation (both the bankruptcy file - schedules, filings, and petitions), as well as the specific correspondence you are in receipt of.
If you are having trouble getting in touch with your attorney, make sure you are trying to contact them in writing - many people rely too much on phone calls, emails (and especially letters) are much more reliable and will help you get a more satisfactory response.