Product: Debt collection

I received two phone calls/voicemails on XX/XX/XXXX and XX/XX/XXXX from Armada Corp . I called back on XX/XX/XXXX and they explained that I had a debt from Summer of XXXX, that was sent to an address that I have not lived at for almost 10 years. I updated my address with them and asked them to send verification/information on this alleged debt. 

On XX/XX/XXXX I received another phone call from Armada Corp . I answered this time, as I recognized the number. The agent told me that they sent a verification, but I told them that I did not see anything come through the mail. 

Sometime around the week of XX/XX/XXXX, I received a letter with an amount due, and a " statement '' from XXXX  XXXX XXXX. Attached on a separate page, was a document typed up in Word that listed some charges, my name and some charge codes with no explanation beyond that. 

On XX/XX/XXXX I responded to their " verification '' to let them know that I was disputing the debt and asking for additional clarification/information on the debt, in order to properly verify that I indeed owed this debt, that allegedly was almost 1 year old. I asked for : # 1 : Original Invoice from the healthcare provider ( as it was never originally received by me- it was sent to an old address ). This would also help me to understand the specific dates of service to further verify the debt as this apparently occurred in Utah, and I live in Oregon. 
# 2 : Proof that I had agreed to the services that were being collected on.

# 3 : Verification that the agency was working on behalf of the original creditor, or if the debt had been purchased.

# 4 : Proof that the agency had the legal right to collect debt in the State of Oregon, as this was a debt from the State of Utah.

# 5 : I asked for all phone communications to be ceased. 

I felt that these were reasonable requests considering that my information had already been used improperly with wrong address, not original invoice ( that I would have received if they didn't send to wrong address ) and other pertinent information, including dates of service to help me understand what was being collected on. 

On XX/XX/XXXX, I received another letter, this time the Creditor had been changed from Utah Emergency Physician to Mountain Land Collections and the invoice had accrued interest. I had asked interest to stop, until I could verify the debt. They provided another copy of the " verification '' document that they had provided in their XXXX letter that was again, missing crucial information for me to properly verify the debt. 

On XX/XX/XXXX, I sent another letter asking about the accrued interest, the change in creditor from Utah Emergency Physician to Mountain Land Collections and again asked for all the items from my XX/XX/XXXX letter, so that I could once again properly verify the debt. I told them that my next step would be filing this complaint, if they could not provide this reasonable information. 

On XX/XX/XXXX I received another letter stating ; " As we have previously fulfilled our duty to provide you with verification, we will not respond to any such requests in the future. '' Again, the amount owed has gained even more interest. They also erroneously told me that they verified the debt on XX/XX/XXXX, but I have no record of them providing anything to me in the month of XXXX. Because of numerous discrepancies, including creditor name changes, incorrect dates and their inability to provide what I believe is a simple request, I am formally lodging this complaint. 

I have sent all my letters via XXXX with tracking, and would be happy to provide all of this information, along with my logs on communication.