I haven't received any further invoices from them since I reported them to the Better Business Bureau in their area. Although the BBB has been diligent, they have had no response thus far. I checked my status this morning and they have sent a 2nd notice due to no response.
I have received another email from Prevention stating that if I get a letter from a collection agency to forward it to their PO Box but the object is not to get one from the collection agency.
Hope this helps.