I paid and have not received my pdf book format?

Hi I paid for the PDF format of the book and it was added to my mastercard on March 9th, but I still have not received anything? I have tried to contact them twice and still I have not received response? Can anyone help me?
For information on the skin picking disorder (Dermatillomania), symptoms, causes and treatment methods, get the Complete Guide to Skin Picking Disorders.