Telkom mobile uage vs Router

Morning all

I need to understand two things. Who is right when it comes to date usage. I do have a 50GB package.
I will post some pics also to explain.

1) I noticed that my Telkom mobile data was stuck till 20-08-15 on 48xxxMB.
2) I noticed that my B593 happily increased during that time of use.
3) Looking up to date 20-08-15 the two identies never compared. Up to now they still don't. If you look at the pictures.
4) I have read some people complained that usage goes through the roof.
5) I still do my daily things as I have always done.
6) I come from a ADSL environment.
7) I know what people will tell me speed. It has nothing to do as per point 6.
8) Getting usage on your PC will also not help, because of devices hooked up to the B593. It will not be accurate. Unless someone can explain?
9) Currently I have only one device hooked up. That is my phone. I also don't allow any more that the phone updates its apps.
10) I also cant see that B593 data usage is out by a large margin.
11) Who gives the most accurate data usage. See Pic's.

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