Call centre, bad attitude and billing

On the 3rd November at around 23:15 I phoned the Vodacom call center querieng about my account and I was attended by the guys called Kamogelo I explained my problem and he could not help me instead of helping me, he put me through to the lady by the name of Lejeune without notifying me and the lady could not help me either and I asked her to put me through to her team leader/ supervisor and she told me to leave my details the supervisor will call me the following day, I'll wait for their call tomorrow if they will call because I still have some issues with them that are still unresolved that I logged them 3 months ago. To cut the story short Vodacom is robbing us, on the 1st of every month I received R200 from Vodacom and the sim card I am querying of is on an iPad and it was off around the 18th October up until today and I haven't used it since, today when I check my balance I have R181.36 and when I ask Kamogelo what happened, he says I used the internet today at around 12:45 and my iPad was offline that time and I only switched it on today around 19:20 so he could not explain what happened to my airtime hence he transferred my call to Lejeune without communicating with me, then I told Lejeune the very same story I told Kamogelo and she said the system is not showing that I have used the internet since the beginning of this month, so what happened to R18.64?