Paying for data I am not receiving

Good day. I am really struggling with MTN at the moment. For the 2nd month in a row they are robbing me of my data. They are giving me half of what I pay for. I have been reporting this and only get reference numbers. They are not customer friendly. I asked to speak to a Supervisor or Manager and they said they will phone me back. I am still waiting. I will never ever recommend anyone to join this network. Bad service. I will be seeking legal advice as I cannot pay for a service I do not Receive.