addmefast url

I started doing a job at an online market place.. My gig sells facebook likes.. finally I got an order, it's my 1st order.. when i trying to put customers link on AddMeFast it says ' URL already exists ' ... I searched for every corner of internet.. There are some AMF clones sites.. but they...

addmefast do not allow users to add the same URL .. I wanna know is there a possible way of adding the same URL ? I've tried URL shorterners but it displays a message ' add only facebook pages ' Many people sell services with the help of addmefast.. How do they do it??? I searched for...