Excessive Billing

*** refers... please investigate the abnormal amount of R7K billed to my account in May. I have paid an average of +- R500 per month and now all of a sudden getting this surprise? there was another amount of around R900 in Feb which I did not query but now with this excessive charge I guess its worth looking at that billing also. we have WiFi at home and my son using Wifi at Varsity. I have asked my bank to reverse this insane amount and \manually"paid over to you what is due to you which is R491. Need detailed explanation else we would be sitting with this issue for long and I will continue to ask my bank to reverse any abnormal amounts unless you can proof its legit - which I doubt"""