Vodafone India — The information she is providing is absolutely wrong one

From Vodafone they said the above services i downloaded from net so they charged for that Rs.49 but the thing from their side they are saying i downloaded some images and i explained them I dint download any images i downloaded some pdf files using my 2G data but the engineer after she said i have been charged for the pdf files which i download but how can i get charged when I have 2g data subscription. then she changed all the stories and telling me that giving DNLD-DWAP_WAL_0049_PPU_FUT00130 this code you have charged like that but i am sure about that i dint download any payable things. The information she is providing is absolutely wrong one. And at the end she went away without i am concerning my issue. and my number is[protected].