Byte count in Indy 10 FTP

Hello!

I'm using TIdFTP from Indy 10 for my FTP traffic. Now one of my customers
got a huge bill on a dialup line and wants to see how many bytes was
actually transfered. How can I get this figure?
What I need is total transfered bytes in and out, including all protocol
traffic, not only the filesize! (It's very small files on an extremely
expensive line, protocol is probably more bytes than actual file
transfering).

Ideas?

Regards, Mikael