Vodacom ***** part 2

My second complaint about Vodacom. On Monday 18 February 2019 my phone was on the charger not close to my desk. At 9:17 a sms came through that said I had 115.0MB data left. At 9:30 it said I my data was finished. At 9:31 my out-of-bundle data used was R11.55. I got an sms every 10-15 minutes until at 10:29 my out-of-bundle data used was R1319.93. All I send in this whole time was a few whatsapp messages which is impossible to come to this amount. I have never used more than 500MB per month plus I usually buy another 500MB in the last few days of each month, which lasts well into the next month. I phoned Vodacom and spoke to a very unhelpful Lerato. She referred it to the “back office” and assured me they would get back to me within 7 days. It is now the 8th day and I’ve heard nothing from Vodacom. My account is currently well over R2000 and I’ve switched off my mobile data because I am scared it will happen again. My monthly account on contract has never been more than just over R1000. This is ******** and Vodacom refuses to correct this or even get back to me .