Does affidavit of survivorship entitle me the house as legal owner?

What does this part mean to you?

“The decedent and affiant held such interest in said real estate until the decedent’s death (date of death here), at which time affiant acquired the decedent’s interest in the real estate as the sole surviving tenant.”

This means that legally, the house IS mine to do whatever I want, right? My mortgage company refuses to believe and won’t accept the papers I mailed in as proof I legally can do anything to the house I want.

My name is on the title and deed for the house but not on the note.

I want to understand why my mortgage company is fighting me on this. I only want the loan documents associated with my account sent to me and they can’t do that right now because according to them, I am not the primary account holder.