Network monitoring software to bill Clients for data used?

Hi all,

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I have been facing this dilemma of wanting to charge our clients for excess bandwidth they use on a daily basis. So far, my stride in doing this was to deploy LibreNMS and setup billing for the specific client VLAN - so if we allow 1GB per day per staff and they are a team of 8, they get 176GB data per month as a team (22 days x 8 staff)

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If the client wants to know which staff is utilizing the most bandwidth out of their allowance, we then drill down to the specific switch interface and we refer them to the port graph

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However, if the client asks for actual data i.e., where did Staff A traffic went to (downloads, browsing, watching vids, etc), we do not have the capability to show it.

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So far... I have trialed the below tools:

• AKiPS - this is by far the most reliable but it is TOO expensive for what we require
• Ntop - I liked it, the price is reasonable but it was not reliable when I tested it. It's probably because I didn't spec my VM accordingly. If you use this and experience otherwise, please let me know
• NxFilter - NetFlow is only a feature of this software and it's probably not its intended function but it is there. The beauty of it is it tells me the domains the user went to
• PRTG - we have a thousand sensor license for this but the NetFlow sensor is very limited in my opinion

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Ideally what we need it is to at least have the ability to keep the logs for 90 days (better if longer) and to be able to drill down specific timeframes as granular as 5 minutes or less?

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Open Source solutions will be better but I can probably convince my boss for a paid tool if I can show the tool can be used to accurately monitor and bill these clients.

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If this is not allowed here, kindly delete. TIA!