Bests & Worsts Reviews from Amazon

I purchased a one year subscription online last year for both myself and my mom for the Oprah magazine. I paid online for both at the time of purchase and have an email to prove it. Now that the subscription is expiring, my mom and I both have gotten at least 3 threatening letters each. Each is entitled "INVOICING BUREAU" in red. The letter states " when you entered into an agreement to be billed later, we believed you would send your renewal payment upon receipt of you invoice. Now that your subscription is coming to an end, we still have not received your payment. You can resolve this matter quickly by returning the subscription invoice with your payment in the enclosed envelope." This letter does not include a phone number and uses a lot of red to emphasize how urgent it is to pay. It is purposefully misleading, I never led on that I wanted to renew. I went to the website and there is no way to contact them, by email, etc. after a lot of searching, I did find the cancel my subscription button.