NOT ONE SMS NOTICE OF THE DATA BILL USAGE

I received an sms on the 19th January notifying me of a R5016.16, which to my shock phoned the customer care line and asked them about it, first I was told no its a miss print and should only be R500, I argued with the lady and then decided to go into a Vodacom store to have it looked at because I had the sms from Vodacom.<br> The lady in store had a look and verified the amount of R5016.16, when I asked her why I had not received any sms notification of the bill when it went over the free data, she could not answer me and told me that the account does have a notification alert on it, why did no messages comes up? it automatically connected without any notice that I was over and would be charged accordingly??!!! Why does Vodacom wait for an account to reach R5016.16 to send an sms saying there is an unusually high usage has been detected ????? which was received only on the 19th on my normal contract number not on the data sim number and only yesterday the 19th when I inserted the sim did a notice with the amount due appear, funny it only came after my phone calls on the 19th, I would like to know how this is going to be dealt with.<br>