they are deducting me for no service

last year september 2014 i bought a house whereby a previous owner had a chubb alarm system. he said if i want it he will let chubb to contact me so we can process the application. at that point i was not sure as i new that this was not in my budget. Chubb kept on calling me wanting me to make a decision and i ended up making a decision of taking it under pressure and i am a women and stay alone. Willie from Chubb came to sign me the contract how ever he did not tell me of any terms and conditions that stands out nor give me the contract and terms and condition. at that point i was confused and under pressure that i did not know whether they will still send contract on mail or was i suppose to receive it there. up until January 2015 when my alarm stoped working then they said i must pay R500 for a technisian to come and fix it, i asked them why must i pay since i am paying R385 every month, they said the monthly fee is only for service and not for fixing i must read the contract and i told them i dont even have a contract, the gyt then forward it on email , it was pdf i cound not even read what was written. i decided to cancell the whole thing and now they debited me for January bu