Popular Mechanics Hearst Corporation All subscriptions are classified 'auto-renewal', if renewal $$ not sent promptly, threatening letters are sent Harlan, Iowa

A couple months before my subscription to Popular Mechanics was going to expire I began receiving odd invoices from various companies to renew at an inflated price. The 'invoice' did not show any relevant data, when the subscription would expire, how long the renewal was for, how many issues I would be paying for (turns out PM has cut their publication to 10 issues a year), there was nothing except a bill. I ignored a couple of them. 

Then I began receiving notices that said I had checked the 'bill me' option somewhere and owed them money and that I was going to be flagged in their system as a non-paying customer. I knew that to be bogus and ignored it.

Now I am receiving threatening letters that hint that I will be sent to collection. The magazine has stopped coming, but still I get billed. The invoice amount has dropped to a more realistic amount, but there is still no information as to the start/end of the subscription period and the number of issues I am supposed to be paying for. 

Their latest gig is that somehow I have been flagged as an automatic-renew customer and owe them $$ every year, even if I have NOT indicated that I want to continue to receive the magazine. If you look at the fine print on the bottom of their web 'subscribe' page, it says exactly that. All subscribers are considered to be auto-renew.