Data depleted for no reason

<p>I noticedy data balance dropped by 400 mb in a day for no reason.</p> <p>There are no background apps using data besides the usual Facebook and whatsapp. I have a very accurate data tracker but it only shows a 50?mb usage which is in line with my usual daily usage.</p> <p>I check and monitor my data usage daily on both the data tracker and my account balance. This is very pecu**** and not the first time that Vodacom has taken away my monthly data when my weekly promotional data was expired.</p> <p>Unfortunately I tried calling customer care but been waiting for over 35 mins and cannot wait much longer.</p> <p>Vodacom seriously needs to fix this problem as our data depletion on our account does not match data usage at all. Clearly we are getting **********.</p>