No response from MTN regarding line issue

I have been having endless problems trying to get MTN to look into my data and airtime issues since I upgraded last year. I get constant messages that I am out of data/ airtime - - on the same day that data/ airtime for the month has been renewed. I have been trying ever since to get through to the call centre (at times holding on for close to an hour), to no avail.<br> <br> I then logged a complaint online at the beginning of April. Almost a month later I have had no repsonse of substance. In fact they only repsond when I request an update. And all these email repsonse have been from different people saying they will look in to it!!!<br> <br> In essence I am paying for a service which I am not recieving. I cannot cancel the debit order either. OS frustrating. There is no one that I can phone ot discuss this as the only point of contact on the website is the call centre. SO!!!!??????