Written notification about debt: Debt collection

I discovered a collection account being reported by Radius Global Solutions for $910.00 on my credit report. I have no knowledge of this alleged debt, I do not know what it relates to, and I was never provided an initial collection notice informing me that this account had been placed for collection. As soon as I discovered this account, I contacted Radius Global Solutions and requested validation of the alleged debt. During that call, I was advised that the requested documentation would be mailed to me. As of today, I have still not received anything. If Radius Global Solutions claims that an initial notice or validation was mailed, I am requesting that they identify the exact address where it was allegedly sent, the date it was mailed, and provide evidence that such notice was actually generated and mailed. I am genuinely curious what address the company has on file because I never received any correspondence whatsoever regarding this alleged account. Without proper notice, I was denied my right to timely dispute the debt before it appeared on my consumer credit reports. I have repeatedly requested documentation, yet Radius Global Solutions continues reporting this account while failing to provide the evidence necessary to establish that the debt is accurate, belongs to me, or is legally collectible. This is unacceptable.