no monies owing but account suspended

My statement from Telkom says that R2409.22 cents is due to be debited from my bank account on 29 Dec 2017. R2000 was deducted form my bank account on 9/12/2017, and a further R409.22 on 13/12.2017. I therefore owe R0, and payments were made in full 3 weeks before the due date. Despite this, Telkom has suspended my account for both my home internet and my cell phone and say it will take a minimum of 7 days to resolve. I have called the call centre 4 times, and had different responses to my complaint each time - first I was told to send through proof of payment, which I did. Then I was told that as the error is with Telkom, the complaint will be resolved in 24 hours. Now I am told it will take 7 -10 days. This is entirely unacceptable.