Bad Service

Despite numerous emails I get no reply to my query - which should take a few minutes to resolve. My data per checking via *136 # still gives 190.21 MB and yet MTN send me a message stating all my data has been used. Secondly I was always able to carry over any unused data for 1 month - now nothing is carried over. Why is this???. I have tried phoning 135 but was kept holing for ages so cancelled the call. MTN must please answer this