Bad customer experience

I purchased 2G which was not credited to my phone. I lodged a query which I never received feedback until I called them. I was told by an agent that the data was no where to be found and will not be reimbursed. .She refused to put me through to her superviser S .She refused to advise her superviser to call me back as she said they do not call customers back .She did not want to escalate my query to someone higher as I was not happy with the outcome .She refused to direct my call to the complaints department as she said she doesn't know them or have their number The list goes on..