Unauthorised Extra Charges

After receiving my new account dated June 2015, i went through it & discovered being billed for something i did not authorise.<br> I called in to accounts department & was told i changed a package (which i did not) & was billed for the change.<br> I then told the agent that i have not changed nor have i authorised anything on my account in almost a year since the last time they billed me for a service i did not have.<br> Furthermore i told the lady i have signed a 24 month contract so NO increase suppose to affect me because i have signed a binding contract...<br> This Autopage will be losing another client very soon amongst the other thousands they have lost already...