I too, like you guys have been sucked in by this scam. Fortunately I only ordered my 'trial' pack, whereby I only had to pay p&p, a week ago today so they still haven't taken any more money out of my account.
As the contact details provided by these websites (nutriberry slim & vitalcleanse) are bogus I'd go as far as saying they're fraudulent.
The card that I payed for the products with and unknowingly signed up for a membership with is with Natwest, who we all love and adore. I will be calling up the fraud team today to cancel any recurring payments from the company that have previously taken money out (amounting to around £10). My boyfriend who works for another high street banking group, assures me that they should be able to do this. And if they start banging on about how it's your fault because you entered your card details and signed up for it, you tell them you were mislead and that you cannot contact them to prevent it from happening as the contact info available for them is invalid. If they still refuse to do anything, then they clearly don't value you as a customer, so is it really worth banking with them? If other banks can stop a recurring payment, then as far as I'm concerned Natwest should be able to too! So, if they say they can't do anything to prevent these scam artists from taking money from account, I don't really want them to have my business, and therefore plan on closing my account with them. This is drastic, but is an option.
I will post back with a result. Regardless, those thieves won't be getting a penny more out of me.
Oh, and a week on, I still haven't received my trial pack, but started weightwatches and lost 5lbs.