***** Teleservice and Buypcnow.com

I paid R20.00 with my credit card at Teleservice for postage of a cellphone that I "won". Now I found out that Buypcnow.com has deducted R15.24, R303.44 and R300.50 from my credit card that I do not know of or gave authorization. I never agreed to anything from them I do not know how they got my info. For Teleservice that send e-mails everyday for payment of something that I did not received I try to unsubscribe but for some reason you cannot. And how can I cancel something by Buypcnow.com that I do not know of or bought anything from. This is a **** and I do not know how to stop the e-mails. I advised my credit card bank about this and did put in a dispute. I just want them to be listed as ***** because this is *****.