Vodacom is a bunch of *******!!!!

This morning I went on to the internet and read my Facebook and searched for a map of the western cape on google. I then was thrown off the internet and received a message that I only have 3 meg left on my bundle. I phoned Vodacom and was sent from pillar to post and was cut off how many times until I got to someone that told me my new bundle for the month of March was allocated just after 12 last night. I connected to the internet at 7:30 this morning and not even 2 hours later I have depleted my monthly 3 Gigs. This is impossible as I use 3 Gig per month. Why don't you do yourself a favour and look back on the other months and you will see that is what I +- use every month. How can I then this month deplete it all of a sudden in 2 hours? I demand that this situation be investigated and fixed. I would also like to cancel my contract. I would much rather support another company that doesn't ***** consumers bandwith.