Poor customer service

I am utterly disappointed and regret joining the Vodacom contract services.at this point I just wish to cancel the whole contractual agreement I have with them. After responding to their mail about my missed payment and making payment arrangement towards paying the amount missed for 1 month Vodacom went ahead to log my numbers without any communication or notification . What is then the point of them sending the email that you must call them to discuss other options if then they will still go ahead to log your account even after an agreed payment options. This it utterly torture and holding people ransom just because you missed a payment however one took an effort to communicate with them for exceptions.