OUT OF BUNDLE DATA NIGHTMARE!!!!!!

This would be the 2nd contract wherein we have experienced this problem - UNEXPLAINED "OUT OF BUNDLE DATA" CHARGES!!! I woke up to a string of over 8 text messages from Vodacom sent over a period of about 7 hours (during late night and early morning hours) advising me that I have allegedly used in excess of R1500 out of bundle data!!!! My reaction - WHAT THE HELL??!!! HOW??!! Ive had a CONTRACT with Vodacom fir many years and NOT ONCE have I been charged with out of bundle data whatsoever! I have from time to time topped up and bought data packages but thats it! I have 24hr access to UNCAPPED WIFI and have never needed to worry about mobile data! Now for an unexplained reason I allegedly owe this absurd amount to Vodacom? Tomorrow I will initiate the tedious exercise of attempting to FIRSTLY CONTACT AND GET AHOLD OF AN OPERATOR (who is hopefully TRAINED), get Vodacom to "assist" with the matter and I KNOW it will be more than frustrating and anything but fruitfull - however I HAVE to try to prove my case. I am so sure that Vodacom will once again fail at delivering a so called "service" that I will immediately proceed with CLOSING MY BANK ACCOUNT to ensure they don't get a cent of this so called AND ALLEGED "out of bundle data usage" - I will ONLY pay what I have used and will no longer stand for THIS nonsense! My husband had so many issues he had to resort permanently switching off his mobile data to avoid Vodacom from *****ing our money and just shrugging their shoulders when asked what the HELL was going on! SOOOOO SICK OF VODACOM'S "SERVICE" GOODLUCK Vodacom with proving your case in court - Should this matter not be resolved I will proceed to sit back and play the defender's game while Vodacom sues me and tries to prove its case in a court of law - I will NOT ACCEPT being bul**** by some corporate