When is this going to be sorted

I called vodacom last month on the 20th of January to querie my bill regarding my data usage for the month. The call centre agent told me they will investigate the issue and someone will get back to me within 48 hours. <br> <br> It is nearly one month later, i received a sms on the 21 and 31 January that my querie is under investigation and i should receive feedback the next day .<br> <br> I need to pay for the investigation , it is almost one month later and no feedback . <br> <br> I guess this is the level of service vodacom is used to give their clients.