What can I do to make this creditor to stop calling me?

They change their phone numbers constantly. Call me at all hours. It is about my Father’s funeral. My father prepaid his funeral. He passed away at my home not his . Now the funeral home , who never told me it would cost more, sent me a bill wants $247. My father did not have a estate. Really. He was not a rich man. I am not a rich woman. They bugging the hell out of me. Ever had a this problem? Creditors! I hate them.