How did you place the order? By phone? Online? By calling into their office? As the result of a doorstep cold call? By inviting their rep into your home with an appointment?
Not all of those situations have a 'cooling off' period. (For example there's no such period if you called into their office or invited a rep, by appointment, into your home). You might be stuck with the contract and (unless they fulfil their side of it within a reasonable time) be unable to get out of it.
However I must admit that I'd be worried about doing business with any firm whose 'terms and conditions' page looks like this!
http://www.aweenergy.com/tandc.php
Even so, my own next course of action would be to send a
written demand for repayment of my money, together with a threat of legal action, following the procedure I've explained here:
http://www.theanswerbank.co.uk/Law/Civil/Question1273520.html
Your letter should be addressed to:
The Company Secretary,
Awe Energy Ltd,
20 Paradise Square,
Sheffield,
S1 1UA
That's the registered address for the company but I'd also send another copy to:
The Company Secretary,
Awe Energy Ltd,
212 Middlewood Road,
Sheffield,
S6 1TE