poor customer assistance

I called up the customer service line on 173 asked the agent why my data ran up so quickly she then went in to that m internet was running in the background I assured her that that was highly unlikely as I checked that as well as my data was turned off how can one go from having 500mb to 3mb in less than 3 hours when your mobile data is turned off she gives me the time period from when I loaded the data 05:30am till 11:00am thereafter she cannot day what was running as the system doesn't update? What kind of BS is that ? I explain it again she tells me I'm asking irrelevant questions ,and repeating myself .excuse me whether I ask you ten million tim you need to have telephonic etiquette and not tell me that my questions are irrelevant I paid for the services .and when I asked for management she put me on hold for 10minutes then hung up the call. Pity I did not get her name ...this call was made at 17:25 pm this lack of customer service ,how do companies hire or train people that do not have any professionalism ???? I work in the customer service industry aswekl if this was I I would have lost my job immediately disgusted