Unfortunately there seems to be an almost unlimited supply of morally dubious companies like this that prey on people's desires to get "up the ladder".
Having studied IT for 5 years at university I left without getting an IT job for 4 years. I eventually got one but obviously it took me a while, so for these companies to be suggesting that you're guaranteed a job with far less study is completely ludicrous. What I can say is that the courses these companies provide range from the very basic, to the far too hard for the inexperienced.
Lastly, I'd say that these companies charge several times more than an open university or college access course would, and at least there you'd have access to tutors.
If you're really thinking of going this way instead of College or Uni part time courses, then you should try googling a bit. Quite often you can find the course materials and subject matter freely available online, and you just have to pay for the exams. This can end up saving you hundreds if not thousands of pounds, and you're not subject to some dodgy credit agreement at the end of it.