unable to make calls

Hi there, I have had it with MTN I find myself having to swith my phone on and off due to the fact that the mtn lady always tells me that I don't enough airtime or that I have exhausted my airtime when I have airtime in my phone.<br> I have called your customer care and was told that I needed to switch my phone off and on and I have been doing this almost for two years now, can someone help or if you can't please cancel my contract without any cancellation fees as this is not my doing but yours.<br> <br> I sent this to your complaints department and was promised a response in 3 days but that has not been the case, if this does not get resolved I will Have no choice but to wait for my contract to expire and move on to other networks. <br> <br> Regards<br> <br> Unhappy to be lost client<br> <br> Mathope khoarai<br> <br> ***