In EpochStats is there a way to get the total rebills figure, not including new sales?
 

Had a quick look, didn't spot it, is there a way?

If you're referring to the old interface then:

Login -> (on left hand side) Epoch Reports -> Statistics -> Rebills

is that just for merchants?

Or is there a way to do it in Niftystats?

It's the merchants. I'm not sure if what affiliates see when they login.

Try emailing their support. They reply pretty fast.

I don't think there's a way to do it in Epochstats but in Nifty you should have a "rebills" column, so you just select the date range you want, click on the "+" next to Epochstats and you'll see the rebills for each program for that date range.