Complaint sub-issue: Debt is not mine

In XXXX of XXXX I received a collection letter from XXXX XXXX XXXX. They had no knowledge of the type of debt, nor did they submit a bill that would provide information legally required to collect funds. In a conversation they said that they did n't have any documentation to send me but that I owed it. I served XXXX & XXXX with a XXXX demand letter for evidence or the removal of the debt from my credit. Proof- XXXX XXXX XXXX rcvd XXXX # XXXX XXXX XXXX XXXX XXXXThe written demand included:1. Name of Clinic where services were performed - 2. Date of Service - 3. Copy of bill - 4. Copy of Explanation of Benefits - 5. Proof that I was served with a copy of the bill as none of this was sent to me. 
I never heard of this physician nor had I ever received a bill. 
In XXXX XXXX, I received a collection call from XXXX XXXX XXXX and was asked to make a payment. I informed them that they did not respond to my demand for information and that they had sent nothing to me to substantiate this fraudulent claim. In the event that they do not do so, they are legally required to remove it from my credit score and failed to do so. Once again I reiterated that I had no knowledge of this claim and referred to my request sent on XXXX XXXX, XXXX. They confirmed their receipt of my demand but stated that they were still unable to procure any of the documents from their client. 
On XXXX XXXX, XXXX I called to follow up on whether they had updated my credit score. They said that they still were unable to remove the information due to the fact that the government was in a shut down. ( California State was in financial trouble at this time ) They made no mention of now having any information nor did they copy me on anything. 
On XXXX XXXX, XXXX I sent another formal demand letter. It stated the same facts above and demanded that they remove this from my credit report and to send me a written statement of proof that it had been done. There was no response. 
In XXXX XXXX I realized it was still not done, and called again. I left XXXX verbal messages and heard nothing back. On the XXXX call, they said that they still did not have documentation and that they would be getting back to me. They did n't. 
Finally I decided to send a formal complaint to the XXXX. I made the complaint on XXXX XXXX, XXXX. Grant and Weber did not respond to their request for information and the case was closed " Unanswered on XXXX XXXX, XXXX. They said that XXXX did not respond to their inquiry. 
I received a letter from Grant and Weber on XXXX XXXX, XXXX. It states they sent a bill on XXXX XXXX, XXXX. Under penalty of perjury, this contradicts their verbal statements that they did not have any documentation. As of today XXXX/XXXX/XXXX, I still have not received a legal bill. I have received a letter ( letterhead of XXXX XXXX XXXX XXXX ). It states that I received XXXX on XXXX XXXX, XXXX. This document does not meet the legal requirements of a medical bill as it does n't contain a tax id or CA State Medical License Number. Further it includes an address that I have never been to in my life. There is no diagnosis code. XXXX XXXX XXXX failed to provide any type of proof that I received treatment or that a bill was created and sent legally. They have not met the legal requirements of a collection firm and I ask that you please help me. Thank you.