LINE BLOCKED WITHOUT WARNING OR FEEDBACK

I have logged a complaint against MTN on 15 December 2015 for billing that can not be explained and the lines were opened on 18 December 2015 but then again blocked again on 25 January 2016 without any notice of what is the reason for the outstanding balance I owe. The call centre agent has since told me that I owe about R900 outstainding even after my monthly instalment that has been paid on 20 January 2016, the call centre Thabo referred me to their legal department and promised to send me the contact numbers via my email address which he never did. WHAT IS THE BALANCE I AM OWING AND FOR WHAT? WHY AM I OWING THE AMOUNT THAT THEY CAN NOT TELL ME WHAT IT IS FOR? WHY AM I STILL RECEIVING MY STATEMENT VIA EMAIL WHEN I STATE EVERYTIME THAT I CAN NOT OPEN THE STATEMENT? I AM TAKING THIS THE LEGAL ROUTE AS I CAN NOT GET ANY JOY FROM ANY MTN SERVICE. THE STRESS I AM GETTING IS NOT WORTH IT, AFTER ALMOST 10 YEARS WITH YOUR CONTRACT I WILL HAVE TO TAKE MY BUSINESS SOMEWHERE I WILL BE APPRECIATED.