If you tell them you're going to make a payment, they are going to pressure you to do a check by phone, and you still may not get the address.
First, BY LAW, if you ask them who they are they must tell you. Section 806 (6) of the FDCPA, they must identify themselves when asked:
§ 806. Harassment or abuse [15 USC 1692d]
A debt collector may not engage in any conduct the natural consequence of which is to harass, oppress, or abuse any person in connection with the collection of a debt. Without limiting the general application of the foregoing, the following conduct is a violation of this section:
(6) Except as provided in section 804, the placement of telephone calls without meaningful disclosure of the caller's identity.
In Section 804, regarding 3rd party communication, they are not allowed to say who they work for unless specifically asked - so that section to would apply in that you are NOT a 3rd party.
I suggest you mention the FDCPA if you speak with this witch again. She many hang up on you, they don't like it when people know their rights.
The other possibility, PM me and give me the 800 number that's calling you, and I can have some people track it down. This is done all the time with great success. Once we know who it is, we can find an address.
Have you ever gotten any WRITTEN communication from this CA ? If not, that's another violation of the FDCPA - they MUST send you a letter within 5 days of first contact.
IF you are called at work again, you tell them that your employer does not allow personal calls and they are never to call you there again. This is also in the FDCPA:
§ 805. Communication in connection with debt collection [15 USC 1692c]
(a) COMMUNICATION WITH THE CONSUMER GENERALLY. Without the prior consent of the consumer given directly to the debt collector or the express permission of a court of competent jurisdiction, a debt collector may not communicate with a consumer in connection with the collection of any debt --
(3) at the consumer's place of employment if the debt collector knows or has reason to know that the consumer's employer prohibits the consumer from receiving such communication.
Quote her that section of the FDCPA and she'll know you're not going to tolerate her abuse and you may sue them for their violations. Sounds like they're racking them up already.