GloCell blocks my phone when THEY OWE ME money!!!!!

It took me 13 months (my first ticket logged was 8/8/16) of phone calls and emails (bearing in mind there is only one email address to be found on the internet - which doesn't work because no one has EVER responded to it) to get GloCell to change my email address so that I could again receive invoices and statements. 90% of my phone calls are futile because I just get put through to another person and another person and another person until I either put the phone down out of frustration or am met with empty promises that "someone" will get back to me. No-one ever has!! In the time that I was not receiving invoices, I have been paying a "thumb-sucking" amount every month - which has since come to my attention was more than DOUBLE the amount of my subscription. When I did eventually did get an Invoice I saw my subscription was R245 a month and Ihad been paying between R450 and R600 a month. The frustration and waiting game to get a statement again pursued and I stopped paying because in my books I should almost a year's credit. 3 months down the line, still no statement or explanation despite more empty promises that "someone" will get back to me and on Wednesday I received a sms and emai to say if my account is not paid by tomorrow my phone will be blocked. WHAT!!!!!! YOU PEOPLE OWE ME MONEY!!!!!! I am not paying a cent until my statement has been received and sorted out. I sent a mail on Friday morning saying that this had better be sorted out by end of business else I will be going public - to which I received a read-receipt and no further correspondence. This is disgusting, unacceptable and constitutes *****!!!!!! When I'm done here my next mail will be to the ombudsman. Needless to say may days of using CellC are OVER!!!!