If I could select more than one nature for the review, I would

I cancelled my mobile contract and gave my contractual monthly notice for October 2017 - ref ********** 4. I noticed a deduction of the FULL amount in December, but did not receive an invoice prior to this deduction. I instructed my bank to reverse the deduction as a result. Attempts to contact you on ********** 600 remain unanswered. I then attempted ********** and got through to your support desk. Its difficult to hear your agents because of the background noise. I requested to be taken off speaker phone, apparently I never was and was informed the agents use headsets. If that is the case, your headsets are terrible because you can hear the entire floor. Difficult to hold a conversation. After a long, long debate with your agent, I requested escalation to a supervisor to resolve the issue. The agent refused. I dropped the call and attempted the 011 number again. Still not answer. I have emailed you as well. Please contact me so that this can get resolved. In hindsight, extremely grateful to have cancelled the contract in light of the pathetic customer service I received.