Usage format

[#1]

Is there a way to filter/sort historical usage? For example, I'd like to be able to see how much data I used every month for the past few months.

Or perhaps a customer service person is able to get that data for me? 

[#2 · Accepted solution]

Exactly.  There's always been a very good breakdown of this on Broadband, but on Mobile it's sadly lacking.
You can see clearly what you've used in the current month, but if you don't check what you used at the end of the last day of your billing cycle, it resets over and you are stuck with the excruciatingly slow and next-to-useless 10-at-a-time 'historical usage breakdown' page.  You can't even download that as a .CSV which would help, you're expected to page through.  The breakdown is giving me a breakdown, frankly.
Why no per-month summary, PlusNet?

Update:  I found the summary usage I crave!  Go to History > Bills and download the PDFs, last month's usage summary is on page 2 of this month's bill .pdf.   All the gorey detail is on subsequent pages.  Phew!

[#3]

Thanks @edrandall!