Background data from sbrowser caused me a bill of $15k

Hello guys,

I am searching for help to investigate the "internet" app data usage that used background data while I was on roaming, causing a bill of K.

From the data usage I can see that the app that consumed was "internet" over background data, it points to the app "com.sec.android.app.sbrowser".

I have rooted the phone and created a full backup of the phone, and I am now trying to dig into the files to see what kind of site/data was used to pull this 4GB of data on the background.

I was not able to find any relevant file under /data/data/com.sec.android.app.sbrowser
I was also looking into /data/system/netstats

I have a couple of files but I cannot match them to nothing:

dev.1436964562021-1438262284253
dev.1438323941223-1439644944250
dev.1439711478805-1441041568238
dev.1441041681919-1442338775052
dev.1442341207969-
uid.1436965462539-1438262284253
uid.1438323980657-1439644944250
uid.1439711478805-1441041568238
uid.1441042703197-1442338775052
uid.1442341207969-
uid_tag.1441047111561-1441726915830
uid_tag.1441728252039-1442336958585
uid_tag.1442337051894-1442769303730
uid_tag.1442784626099-
xt.1436964562021-1438262284253
xt.1438323941223-1439644944250
xt.1439711478805-1441041568238
xt.1441041681919-1442338775052
xt.1442341207969-


Can someone please guide me what files would contain the traffic info? I am desperate to identify the root cause so that I can provide to the provider.

Thank you a lot in advance.