Money *****ers!

This company claims that I owe them money, a total of R1416 and also sent me a notice of demand after I reversed an amount they withdrew from my acc. How they got hold of my details was when I app**** for a small loan from Getbucks last yr! When I called them they said they have the right to subtract as I subscribed to something of them. I am now trying my best to get rid of them. People pls dont just tick off a box on any site when applying or signing up unless u are sure it is for that specific site u are visiting.