THEFT OF AIRTIME / DATA

I did not believe it when reading all over Social Media and seeing all the negative comments on Vodacom with regards to disappearing date and airtime until it happened to me. I very seldom use my 1 vodacom phone number, maybe every 2 to 3 months I switch it on to send messages and make a call to a client. I switched my phone on the other day and made a call for app 2 minutes. Switched phone off and then a few days later switched it on again and behold NO AIRTIME AND NO DATA!!!. On speaking to the consultant she tried to pull the wool over my eyes saying it was all the updates!!! really when I only use this phone over wifi (Vodacom must really think your customers are dumb)...never had a problem until now...so you mean to say that 3 to 4 months worth of airtime / data gone in 1 minute due to updates and running apps (which I use over wifi) she proceeds to tell me it happens when the wifi is off (which is never off). I did advise her that my wifi is never off as I work from home and the phone is always off!!!!! She did however reimburse me for last months airtime / data and said she will not reimburse me for the other months. Vodacom, what is going on with you???....airtime and data disappearing into thin air with stupid excuses...I want this resolved and when both of my contracts are up...I never ever want the name Vodacom uttered in my presence!!!!! I have had endless issues with Vodacom in the past with irregular invoicing!!!!! and now this ...SORT THIS OUT!!!!!!!!!