Basically, when their 30-day free trial ended, they were faced with the regular £79-per-year subscription. Naturally, in the small print of the T&Cs, it says that, once your free trial period ends, you'll be switched to the yearly rate.
Problematic TV personality Giles Coren found out about all this and wasn't happy, taking to Twitter to vent some spleen. He said: "You bastards Amazon! I can't believe you've been screwing me for £79 a year for Prime! I had no idea."
"I mean, Amazon offer a free trial in 2012, then quietly start charging £79 and never tell me. That's what sicko porn sites do! I've heard..." He added: "I apologise for all these retweets re @amazon scam, I know it's losing me followers. But this cynical corporate rape is too scummy to ignore"
The problem is, the service was £49 per year, but then it was increased to £79 last year, which no-one seemed to know about.
If you think you've signed up for an Amazon Prime content and are in your free period and don't want to end up paying for the service, here's what you should do.
Go to Amazon and hit 'My Account' at the top right corner of the page and, in there, go to 'Settings' and then hit 'Account Settings'. There'll be a column called 'Manage Prime Membership'. You want to be hitting that, obviously.
Once you've done that, a new page will pop-up, which will tell you whether or not you've signed up to Amazon Prime, how long you've been a member for and who is paying for it.
Here, you'll see a button to stop your Amazon Prime membership. Importantly, if you think you've been incorrectly charged for the service, you can apply for a refund on the customer services page.
It is official too. An Amazon spokesperson said: "Customers who sign up to a free trial of Prime receive an email informing them of the duration of the free trial and how to avoid continuing to paid Prime Membership."
"Customers who become full Prime members can cancel their membership at any time and we will refund the full membership if the customer has not made any eligible purchases or used any Prime benefits. So as long as you haven’t used the free delivery, downloaded or streamed any videos through the service, or borrowed a Kindle book, you can simply cancel the membership and reclaim the subscription."