If you're a commercial account of that size, you should be able to get your bills in machine-readable format from the phone service provider. That makes it easy to do statistical analyses.
Oh! That's easy! Just make a line graph, on the left axis write minutes used, on the bottom axis write the company. Now, draw one horizontal parallel to the bottom one wayyyyy up above it and mark it as "A WHOLE FUCKING LOT". :)
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