Vodacom
Overcharge on data even though cap in place

I have a wifi modem (0826876177) for home use with 3gb allocated per month. Was having problems with connection so phoned support on 30 Nov 2013 and was told to reset modem etc which worked but while on the phone I asked the consultant if I had any data left to which he replied yes a couple of megs and confirmed that I had not exceeded my limit (for which I have a R50 cap in place). So I switched off the modem then and there so as not to go over.
The next day (1st Dec) when I switched on my phone I suddenly got sms' in succession telling me I had for example 75mb left, then 50 then 20 then that I'd exceeded it. I followed up with support again and they eventually told me my account was now frozen because I had exceeded it by R110.
What I have been trying to resolve (with countless calls) is - why did the consultant say I had enough data left then the very next day I get a barrage of sms' and why did the cap not work?
My account is normally R179 a month and I want this correct amount reflected for end of this month (January) statement but as mentioned many calls have been logged but not once single person from the accounts department has bothered to get back to me to rectify

Company: Vodacom
Country: South Africa

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