Bil**** for a data usage of R3775.39 for december

I received my statement and notices that Vodacom billed my unlimited contract with R3775.39. I disputed the bill as I never received a sms notification that the data went over the allocated data. I asked Vodacom to look into this and till today I never received feedback regarding this matter. I just tried contacting Vodacom customer care twice but the signal for Vodacom is so bad now a days my phone just shows call failed. I have never used so much data on any of my contracts nor have I ever gone over my data usage on my unlimited contract until recently. Vodacom cannot tell me where my data has gone to and what was used where. I refuse to pay a bill that I cannot see where data was used and by whom. It seems Vodacom has spiked data usage with many other customers as everyone who is with Vodacom complains about high data usage. I will take legal action against this as it us unacceptable that you receive a bill that high with no explanation or proof of usage. I want a complete data log sheet to show where and what the data was used on as I did not use all that data. Vodacom seems not to take responsibility for incorrect billing and bills loyal customers.