Rediculous billing

<p>Good day. I've got a modem with telkom which debits me R119 p/m at the 1st of each month. End of August, last month, my debit order was unsuccessful. (1 September 2016). On 15 September 2016 (not even my salary date) telkom debited my account with R374.35. I queried this with telkom and spoke with 3 agents after eachother. 1st agent stop replying on the online chats. 2nd agent told me the new interest rate billing came into place the 1st of September 2016. I asked him to send me proof of price changes, hung on the line for over 10 minutes "while he's getting it" then line eventually cut. 3rd agent told me the R374.35 is for R119 unsuccessful debit order. That was for end of August. R136 for interest for failed debit order... and R119 which is due end of September, they just gone go ahead and take it now already which = R374. My problem is... How the hell can the interest be more than my debit order and who gave you the right to debit my account when I never gave authorization for the 15th. And ontop of it all, why was the end of September payment taken as well? </p>