PATHETIC - INCOMPETENCE IN ACCOUNTS DEPT

Good day, please advise who I can end an email to, to have my internet reconnected due to your accounts depts incompetence....I got an invoice for R519...paid R660...and it was disconnected?????? when I phoned this morning your recording said that I am R901 in arrears???? invoice shows R519??? SO, I PAID END NOV R660 AND YESTERDAY ANOTHER R519 AS PER YOUR INVOICE SO ALL TOGETHER I PAID R1179 FOR END NOV....PLEASE RECTIFY WHATEVER IT IS YOU HAVE TO ON MY ACCOUNT SO THAT I CAN GET BACK TO THE R660 ONLY....I HAVE SIGNED CONTRACT FOR!!!!!!!!!!!!!! I WAS GIVEN AN EMAIL ADDRESS ********** to send proof of the R519 but the email was returned....I need to be reconnected asap.....kindly advise....