unknown charges

i have got four times charges in one month form clickmoney,hunt4920673&800-418-9320network agenda,i have no idear who they are before until i saw these appear on my statment,i really want to know how they got my card details because i have never shopping on line,also these companies in the USA? i tried to contact to them one by one, but could reach them over the phone, so i sent five time e-mails to each company though their web pages, until now i haven't heard anything from them, so i come online to serch more about it,when i saw that many people same as me, i feel really ashamed for them,how these kind people live on the earth!