“This company advertise for local self employed couriers”

This company advertise for local self employed couriers. They ask for £75.00 to be put on their data base for six months with a guarantee that if you are not happy with their service you get a full refund immediately with no quibble. I was on it for three weeks and did not get any work or any phone calls. I have emailed them about seven times now and guess what, no refund, no answer. The phone number I have is answered by a voice saying a name and goodbye!!!!!. Their address according to their web site is 88 -90 Hatton Gardens, London and the contact name is Mike Davis. Has anyone else been fooled by them??