Suspended account - call centre useless - two months of paying for service that we cannot use

The account was suspended in December 2017. I have spent hours on the phone to various departments at Telkom (technical, sales & billing) and each one gives me the same response "please email your proof of payment to.....". I do email the proof of payment that shows we have paid for the months in dispute, and yet Telkom are so useless they cannot allocate the payments. I've contacted them via their Facebook channel, via the online chat, via email and via the call centre. All are useless. All give me the same result "your case has been resolved" yet there are still no services and when I call I get told the line is suspended. How can people be so ***********!!!!! Now we want to cancel the line but goodness knows how long that will take.