monthly cell phone contract over charged

<p>I have 3 contracts with mtn, I have 2 Samsung s7 edge which I pay 1250, I upgraded in October from my Sony Xperia to a Samsung tablet which I have to pay 199 per month, my bill for this month is 2058 when I call the call centre they say they will fix it and nothing has been until now and they have disconnected my phone's. This is an error from mtn, I have never missed a payment since I been contracted with mtn. </p>