Vodacom and data again

More than 2.5 gigs of data of mine has disappeared in a space of a day or the last recent time I checked my data . I have checked all my settings including my data usage of certain applications and subsequently can find nothing either than the fair useage I already used .My data tracker subsequently tracks my useage from the 10 th of April to today and it does not add up to what has been used .I have been having these problems for the last 8 months where I complain and data is refunded to me ,then it stops and starts again .There is no possible way that you can argue with facts and if my tracker subsequently does not add all my data usage to that which is deducted .With the numerous allegations from the public that data is going missing one cannot dismiss such allegations as subjective and without warrant especially since facts point to a different story .Vodacom please refund data as I am working on a campaign which requires my data and please subsequently give me a call to discuss releasing me of my contractual obligations on the basis that my obligations are becoming increasingly intolerable to continue and as a client who is facing these intolerable conditions should not face prejudice as such .Thank you