Vodacom acts ********* and dont resolve problems

Vodacom says my cellphone suddenly drawing massive amounts of data - once in Dec and once in Feb, that I am to blame entirely, even though there is no explanation. They are treating me like a ********, despite numerous efforts of mine to try and discover the cause. My cellphone bill over the past decade has hardly ever exceeded R1500. They agreed, after lengthy consultation at their Gateway , which included taking the phone in 3 times, taking my computer in and them making numerous calls to consultants in their network, that there is no explanation, they will give me the benefit of the doubt charge in-bundle rates for the last high bill. Then Dylan phones me to tell me that the Gateway shop made a mistake and the customer must pay, they cannot charge my in bundle. Vodacom did not respond to a query of 3 Feb until 2 weeks later, when I lodged another. They cannot access recording with call centre agents, they cannot escalate matters as management does not understand technical issues. I also renewed my cellsure. I was misquoted and then Cellsure said they cannot honor this -I must pay. this is bad service, bad advice and bad attitude. Mainly ********* business practice. P