NO Servive

I have been trying to query a data purchase where I purchased 1GB of data but only received 500MB. I called on Friday 13 November and was told the system is doen. The agent said she would call me back and that still hasn't happened. This morning I called and was put on hold for 30 minutes over a very simple query. The agent dealing with me didn't even check with me every 5 minutes or so to tell me they are still dealing with my query. Instead al I have is ****py hold music for 30 minutes and my query is still not resolved. No one has even heard what my problem actually is.