As others have said, this is an obvious scam on a few levels; bait and switch then failure to fulfill. The pricing structure is not at all clear and ramps up as they fail to deliver. First the price was £19.99. Then the £19.99 was a pre-purchase price and an additional £30.00 was required to complete the unlock brining the total to £49.99. During the wait time an offer to go to the head of the queue was offered for another £9.99 (which I did not pay). A couple days later they send out an email advising the unlock could not be completed and provide a dubious excuse.
There are reputable phone unlocking services on the internet so there is no need to gamble with iPhoneIMEI.net