<prompt> Human: Original thread hereSummary of original: back in October, I received a collections notice on behalf of Verizon, saying I owed them a final bill. I was never a Verizon customer.Since then: I wrote to that collection agency to dispute the validity of the debt. Return receipt says that they received it within the necessary 30 days by end of October. I have yet to hear back from them.Today, I received another notice in the mail from a _different_ collections agency about the same debt. Questions:1. Since I wrote to dispute the debt with the first agency, arent they supposed to write back? Or, if they cant obtain verification of the debt, arent they supposed to at least let me know that much?2. Do I dispute this again? If so, when does this stop? At some point, the money I spend is more than the value of the debt itself printing, postage, receipt, etc. That even ignores the time cost.3. I havent checked my credit report yet I typically do so at the end of January each year. What can I do if this shows up as an unpaid on that?  <response>: Send a registered letter with full signature service toMr. Lowell McAdamExecutive Office of the ChairmanVerizon140 West Street, New York, NY 10007Explain the situation clearly and with all the documented evidence present your case. Use as much detail as you possibly can. Use dates and times and names. After you have received the notice of delivery from the USPS, wait 2 business days and call him direct 212-395-1000 to follow up. Keep calling HIS executive office until you directly speak to the VP responsible for whatever department can fix this. Make firm deadlines and keep on them until you have this cleared and they send you a formal letter stating this has been corrected. Make sure you ask for an actual signed letter with contact information, you will need this letter to clear up if this issue pops up again in the future.I cannot stress this enough, there is one person in that office who can send one email which will make this whole thing go away in 20 minutes. Your job is to find that person and get that email sent. 