You did the right thing by writing not at this address. If they continue to send them I would contact the hospital or wherever they are coming from and tell them you have returned them but you keep getting them and you are requesting they stop.We keep writing on the envelope "not at this address" but they just keep sending them. We got more today and my husband said "I guess I will just trash these".
I did this with a cell phone bill that kept coming here for my son. Once I contacted the company and explained that he did not live here they stopped sending them.
Part of the problem however is our DCs will fill out paperwork and use our address.
Well those are easy words to speak but much, much harder to implement. It just takes time. You will get there, I know this to be true because I like many others here have been right where you are. You have an advantage over me, I didn't know about this site when I was going through my darkest times with my son. It's such a wonderful thing, this site, to be able to share with others who never judge and who really get it."you just need to cut the cord"
Hang in there Okie Girl.