Vodafone India — fraudulent charges on roaming in usa

I have Activated i Roam Free 599 plan on my Number and used it to call india twice in a month and it should be charged @ 1198 Rs . But they send me a bill of around 5990+ monthly rental and Taxes saying i have used Internet Which i have not and gave all the Proofs and i mail Corporatecare.[protected]@vodafoneidea.com asking for clarification on below Questions

1. How can my Mobile Connect to Internet after I disabled the APN settings and Data Roaming ?
2. How is That possible to just only Consume 1 MB of Data every time as per your Bill?
3. The Timings of The Data usage as per the Bill for Example
22/08/19 08:28  21/8/19 10:58 PM EST
23/08/19 09:29  22/8/19 11:59 PM EST
25/08/19 11:11  25/8/19 1:41 AM EST
26/08/19 11:20  26/8/19 1:20 AM EST
26/08/19 16:45  26/8/19 7:15 AM EST
28/08/19 00:02  28/8/19 2:32 PM EST
28/08/19 09:29  28/8/19 11:59 PM EST

Most of the Timings as per the Bill are in the MIDNIGHT Could you please explain me how my Phone without my Intervention just connects to Internet and Disconnects just using 1 MB of Data and that to after Disabling APN Settings and Data Roaming?

They Dont reply to Below and Beat arounf the Bush saying their biilling is Accurate . I am fed up with This . Attaching all the required Images Below

I gave them all the Proofs showing my Settings in Phone that dont allow to connect to Internet and aslo the Data usage on my Mobile showing 0 MB in September 1-30 where as per their bill i have used 3 MB