My question involves collection proceedings in the State of: California.

I have been receiving phone calls from a debt collector, and they hang up whenever I answer the phone. When I called them back, they claim that I owe them money for an account that I have no recollection of creating. When I asked for a copy of the debt, I was told that by law they were not required to send me a copy if it has been past 30 days. I told them that I never received the first noticed and verified that the address they have is incorrect. I have never lived at the address they sent the notice to. When I told them that, they hung up the phone.
What are my rights to receive a copy of the debt? Do I only have the first 30 days even if the address they have on file is wrong?