Out of bundle data rates/poor communication

Just received an sms marked "final reminder" for R3000 of data used out of bundle. When I phoned the call centre to explain why there was no sms from Vodacom stating that I am out of bundle on R500, R1000, R2000 she said that she doesn't know. So Vodacom just *****s our money and then says they don't know. I cannot wait for this ridiculous contract. Vodacom raves on the internet about informing customers regarding out of bundle data rates which is absolute nonsense. So disappointing, having used Vodacom since 2007 and to be lambasted by such a bill, shocking. Wish I could terminate this contract now but will have to be taken for a ride for another 6 months.