Vodacom *****s Airtime

On the first of every month i receive airtime on my top up contract with Vodacom. On the 3rd Oct i had no airtime left at all. I purchased a 250MB data bundle, and with in an hour i got an sms to say i have less than 40MB left and a second later an sms to say i have less than 20MB left. I called Vodacom and the “reimbursed” me R29.00 of my R200 airtime they STOLE!!! Throughout the week i purchased airtime and data bundles and the problem still persists. I have had 4 Apple devices already and this has never happened before, now Vodacom has the audacity to tell me that it is NOT Vodacom it is my device. I have never changed my settings on the particular advise from the time i had set my phone up 23 December 2016. For a little less than a year it has never happened and now all of a sudden my DEVICE is the problem. Vodacom is the biggest ******* and they have their Staff covering up for them. Vodacom needs to give me all my money back on which i spent on data and airtime as well as my monthly airtime of R200!!! Strongly regretting not moving my contract in December as i planned on doing.