Funeral Home Bill

I just need someone to tell me if I am being overly emotional about this. It's been 6 weeks since our son's stillbirth and today is one of those days where everything is either making me sad or angry.

The first funeral home I called to arrange Charlie's cremation offered to waive the cost for us. I thought that was very considerate and we went through all of the planning. I went into the funeral home to sign the papers and they gave me a document that day showing there would be no cost. Today I got another document in the mail showing an itemized "bill" of all of the costs, totaling close to $4,000, and again showing that it was waived. At the bottom they handwrote "We hope you are doing better. God bless you".

Does anyone know if there is a legal necessity for them to send this document to us even though we have already gone through the cremation process, received his paperwork, and picked up his urn? I know I hate the world right now for what happened to our son, so I don't know if i'm being logical or a pessimist. But it just felt gross to send us a bill like that. Just another reminder of what happened. And it's only been 6 weeks, so NO, i am not better. I don't mean to sound ungrateful for their help but it's upsetting.