Ally Financial They're not the least bit interested in following the FDCPA Nationwide

These people call multiple times per day, sometimes in rapid succession. They have no debt with me, as I have never done business with them and I have no outstanding debt of any kind at any time.
Additionally, they are calling my father at both of his phone numbers, multiple times per day.
They lie on the phone about why they are calling. Their story is, they will stop calling (they dont), and they're trying to collect for someone who is not either of us.
They refuse to give their address.

I suspect they are calling over a long dead debt, lost when they foreclosed on and later sold a house at auction that we purchased. These calls started almost immediately after there was a well publicized issue at that house.

Their phone number is 866-205-3074
They claim to be Ally Financial
They claim to be calling to collect a debt
They refuse to provide any other information

Today they have called so far (its 11:59AM) at 9:47, 9:48, and 11:11

I have them call blocked, but my phone still lights up and I thought I'd humor myself by actually talking to them (I had to call back, all they do is call and hangup anyway).

I plan to send a letter to their agent of service at CT Corporation System, 818 West Seventh Street, Los Angeles, CA 90017

they have an address in Philadelphia that their representative Danielle claims is for payments only. That is:

PO Box 13625

Philadelphia, PA 19101

Their address as listed by my secretary of state is:

300 GALLERIA OFFICENTRE, SUITE 201

SOUTHFIELD MI 48034

They appear to be... surprise... a Delaware Corporation. I do not have a Delaware address.

Following the FDCPA is obviously not something they're interested in.