They are the professional scammers and operates under various names; i. E. AppleIphoneunlock.uk, DoctorUnlock.uk, IphoneIMEI.net' OfficialIphoneUnlock etc. etc.
Do not get tempted and trapped with them. You will loose all your money, your time and energy.
If you want to help yourself and others, please join and sign the online Petition against them that someone started to expose them at the following link:
https://www.change.org/p/scammed-by-iphoneimei-net
All positive reviews for them probably are fake or paid reviews