I'm sorry yet another person has fallen victim to Progressive's shady "business" practices. But yes, they will sell the whole "free trial" thing so much that they hope that's all you'll hear. Sometimes, you won't even get the publication or an invoice and you go right to their collection agency - International Credit Recovery - a phony and inactive collection agency in New York. They make it sound so easy to cancel, but you might not even get anything from them and, of course, the invoice itself has no contact information on it if you happen to even get one.
The fun part is that even if you do get everything, there is absolutely no way for you to cancel before your free trial period is over because the invoice arrives after the 30-day "try me free" time span. The rep will say, "Your first issue will arrive in three weeks and your second one two weeks later." That's five weeks, and five days beyond the trial period. Their secret is their script is written in just such a way that they can tiptoe around the truth without completely outright lying to you. It's a clever little scam they've got going on, and usually the only way people find this out is the hard way.
Once these people have their claws sunk into you, they will never leave you alone. They are sales sharks who peddle information that could easily be found online for free...and they simply stick that information into a badly-designed eight-page newsletter that will cost you anywhere from $100 to $700 a year. Even if it had a reasonable subscription cost like $15-$50 a year, it still wouldn't be worth it.
I have heard a few success stories as far as getting subscriptions canceled by contacting their customer service department (try PBP.com for emails and phone info), but I personally cannot make any promises. I used to regrettably work for these pricks and the best advice I can give you to keep them at bay is to make your business phone service not accept blocked calls. PBP hides their phone information, and even if the rep dials *82 or whatever it is to unblock a number, they will not get through.