Telkom has terrible service

Consultant phone in 2017 with an offer for yncapped wifi for R300 odd all inclusive. On numerous occasions during our conversation i have asked if she is sure this is the only amount payable on which she confirmed yes. So every month the account was the R300 odd. All of a sudden in September 2018 i received a bill with over R300 per month back dated since march 2018. When i enquire about this telkom customer care service responded with yes, we under charge you every month and now its time to pay. No call or correspondence up front to inform me about this not to ask am u willing to make arrangement. In May 2019 i phoned again to asked what happened to my dispute. According to them it was resolved and i should pay the acount. I logged a dispute again as u did not agree with the outcome. Even the consultant who helped tgen said that telkom was at fault and should write off the Amount in arrears as well as interest. A dispute is supposed to take no longer than a week. So i was told. After going to a walk in centre and 2 calls on my expense i received an sms today to say case resolved and i am liable for the full outstanding amount. This is unacceptable. My service has been suspended since 28 May and yet they bill me for line rental and wifi for the month of june. Stll not rectified after a query was logged. Telkom is the company with the most worse service ever. Can someone please provide me with an email address of someone who i can contact at telkom. Or maybe i should do like i did with a cell phone provider and email all who is on the board of manager.