Sent a preliminary notice to subcontractor

I requested a preliminary notice to be sent out to a subcontractor who hired me on a residential job. I requested this letter on September 15. Preshipment info was sent to USPS on and arrived at USPS on 9/20. I was paid at about 5:15pm on 9/17. I signed a document that states I release any mechanical lien rights, stop notices, or bond right. The subcontractor received this letter yesterday and said I needed to take care of this. I told him those letters were sent before I received payment and that because it was a preliminary letter I didn’t need to take any more action other than not send any more out. He said that I needed to call level said and make sure everything was closed down because he had called and they had told him it was not. This was yesterday at about 7 PM so obviously no way for me to contact anyone since you guys close at 6 PM. This morning I contacted someone I had archive the jobs and just said I had been paid so please be sure no other notices are sent out. The subcontractor said he turned over the notices to his attorney and that I would be hearing from him. My question is, could I have any issues with the fact that the letter that I requested be sent out on the 15th was actually mailed until the 20th even though USPS received the information on the 17th, the same day I signed the document. On the affidavit of delivery it states letter was mailed out 9/17. When I spoke to the representative earlier she did create a retraction letter but I did ask her not to send it I just wanted to have the PDF in case I needed to send that out but I’m wondering what my best option is.