Paying for the service that was not received.

year 2015 i have registered with college sa to study account course via CIB. Paid the registration funds to received study material and continued to pay my monthly fees. when i call to ask where to sent my assignment that when i was told that the exam date is close i wont be able to right my exam. i asked them why was i not informed about the exam date and the call center lady said they were suppose to tell of inform me. she then put me though the other department and i then told them am no longer want to study with them. after some few month they started to tell me i need to pay my school fees which i don't know why should i pay that because am no longer receiving their service. no they are busy basing me on my cell phone and then sent me an sms that say i need to pay the money or else my account will be handed to the collection team. The question is that why am i paying for the service i never receive? i have to their financial department what happened and i wont pay for that service. i am tired of their harassing sms and email. WILL NEVER ADVICE ANYONE TO REGISTER WITH COLLEGE SA. POOR SERVICE THEY PROVIDE BUT WANT TO MILK PEOPLE THEIR MONEY.