Unable to Cancel my services with Telkom

I moved offices in September 2017. Popped into the telkom office in Hillcrest and filled in the paperwork to have my lines moved. Since then I have been double billed and hours and hours of phone calls and emails don't help me. Telkom has overbilled my company nearly R 30,000 in the last 9 months and it's so unpleasant trying to get through to the service centre and the branch I submitted my paperwork at says they have since deleted all the emails they sent. I am so sick and tired of trying to deal with *********** people.