Harassed and insulted by Teljoy consultant

I had the unpleasant experience of contacting their help desk as I was being invoiced the incorrect amount. I was diverted from 1 department to another and eventually after 13 minutes put in contact with a customer service agent by the name of Bradwin who was so abrasive, rude and disregarded the fact that I was frustrated as I got the run around at my expense. When I pointed out I did not get an acknowledgement of their tardiness and that the fault lay by them. He decided to reverse the override he did on my account and decided to charge me for a unit they had not removed from my profile but took ownership of two months ago. He put the phone down in my face and proceeded to harass me with emails and sms saying I'm in arrears and they will collect unit. Which I was not. I was refused email address to lodge a complaint by Bradwin Mitchell. But I called again and was assisted by his supervisor to fix invoicing.