OVER CHARGING

I have a contract with vodacom,over 2years. The contract is capped on a R100 a mont,for the month of February so far my account are on R453 so far,data charges are at R244,the dat stop about 2weeks ago,when i called i was told \You downloaf to much". My account is capped on R100 how the hell foes it go over. I have read how people are over charged and Vodacom doesn't care. All i was \"" eish download to much\"". How the hell did Vidacom allow the account to go over R100 limit set."""