Worse Billing and Bad Attidute

I have took a contract with Telkom November 2017, the contract was for r350.00 monthly and it contains 1Gb for free and calls are on credit which I understood very well. To my surprise I was billed R 1165.00 . when I call them they told me that I used R500 extra data and it was shocked to me because the store told me once I reach my 1GB it will cut my internet and which it was not the case this one. Please see summary of invoice Subscription & usage for ********** 426 FreeMe 1GB Deal R 1,165.00 Subscription services Description Period Device Subscription Fee 01 Nov 17 - 30 Nov 17 R 250.00 FreeMe 1GB 11 Nov 17 - 30 Nov 17 R 66.00 Device Subscription Fee 01 Dec 17 - 31 Dec 17 R 250.00 FreeMe 1GB 01 Dec 17 - 31 Dec 17 R 99.00 Deal Discount Wireless Activation Fee 11 Nov 17 -R 200.00 Wireless Activation Fee 11 Nov 17 R 200.00 Subtotal R 665.00 Usage Type No of calls/usage Internet/data usage 2412 MB R 500.00 Subtotal R 500.00 I made a call to customer service I spoke to Khendiwe Gumede who advised me that I was billed for Nov and Dec I therefore I asked why the account was not billed for Nov and because I submitted Debit Order details , she told she does not know what happened and she is a messenger I therefore requested to speak to the manager at Durban Head Office by the name of Zandile Magwaza who told the consultant to advise me that I will have same feedback from her therefore she cannot come to the line and she busy with another query, I told the consultant to give her my details , while I was doing that the consultant advised me she can see her walking in and i must hold I was on hold for 40min and the call cut or she cut the call I don't know because I was using Telkom land line and it was not me whom cut the call. My request to Telkom as follows: The must call me and make arrangment on how I am going to pay Nov month bill as it was not my fault that their debit order did not run, they can not assume that the will have double debit on my account with asking me if I will afford to. if it was unpaid debit from my side I will understand that. Secondly r500.00 extra data charge my must waved, as incorrect information was provided to me. I did not make the calls because I did not want to pay more, I cannot afford more.