Refusing to take responsibility of a technical error

I am on a Topup 750 with a 2GB Data package on my main line with Vodacom.To my surprise,on the 4th of February 2017,my call was cut short because the airtime was depleted.To my surprise,data also got depleted on the same date AND THIS WAS WITHOUT THE NORMAL NOTICES THAT I ALWAYS RECEIVE REGARDING MY DATA BALANCE.On the 05th i went to vodaworld service centre and a dispute against depletion of airtime and data was logged on by Kea Mabote.I had also disputed the use and allocation of data on my other lines but unfortunately for data there is no detailed itemised billing.To my surprise,i received an itemised bill around the 15th of February for my main line .The itemised bill showed that i had called only 2 numbers ONLY several times and my husband's number and my aunt's number,whom i was with on a call on the 04th of february didnt reflect on the itemised billing.I went to vodaworld service centre again on the 19th of february to dispute the itemised bill and i spoke to Jasmine and her supervisor Rudzani.They logged a call to their IT but later in the same month,i received an sms from vodacom saying the itemsed bill is a true reflection of my usage,with no explanation regarding why only 2 numbers appear on the billing and these i know for sure that i didnt call during the period in question and also sms's to my mother which were too many to belief that i have written them to her.I also emphasized to Rudzani that this is definitely a technical error because i was never affected by the massive airtime and data error in 2016,now vodacom has me as its victim of an error.I strongly believe this is a technical error and vodacom doesnt want to take responsibility of it because it affected me only and vodacom is taking advantage of this because a single voice wont expose it as thousands of users tha were affected in 2017. With data issues on all my 4lines,they billed me exactly the same ,even for a line that was never used in that month because the tablet went for repairs,Hence i strongly believe that there was a serious technical error and vodacom refused to reimburse me for my loss!i had to buy airtime and data because my life had to go on.