Unexplained data loss issues

After losing approx 1GB of data within 24 hours a call was logged on the 12/10/15 #***. After talking with the agent my account was updated with 1GB bundle as the issue was strange as I make use of WIFI at home (in airplane mode) & at the office. After the consultation I ensured I monitored my data usage by taking daily screenshots which I can provide. I was away for the weekend 16-18/10/15. Vodacom can see that while away there was no WIFI access so cellular data was used & my data decreased from 764.71MB (16/10/15) to 698.08MB (19/10/2015). I assumed the App was the best way to monitor my data but on the 20/10/15 I decided to try *111#, which said I had 1.65GB on the 20/10/15 but the App showed I had lost 1GB of data & only had 665.55MB. I went further & asked for a detailed SMS summary which showed I only had 665.16MB. I would like an investigation into how<br> 1.The loss of data (1GB) can disappear twice in one month over a 24 hour period when my unit is on WIFI & not even on cellular usage & I would like the results to show me when my unit was connected to cellular data &, WIFI.<br> 2.How the 3 points of access to the customer can be better managed to reflect accurate usage.