Double billing: pay or we will cut off!!!

On 12/1/15 I was billed an interim reading of 1384kwh on my electricity account as now meter reading was taken December. On 12/2/15 I was billed a reading for the period 14/11/14 to 15/1/15, but the interim billing was never reversed: an amount of R2003.76. I lodged a complaint on the e-Siyakhokha website and followed up on a weekly basis with e-mails. This was still not rectified on the March account, which I then short paid. I again lodged a complaint on the e-Siyakhokha website but only received a final notice ( a cost of R92.34 was billed on my account for the notice) for the \outstanding amount of R1011". Tio this date no feedback or response have been received from the accounts department nor has the interim billing or the final notice costs been reversed on my account. Are they just ignoring this and hope that I stop demanding the refund and add this to their coffers?"""