OVO Charge Anytime shows zero in the billing details.

Actually, this looks correct to me!

The OVO Charge Anytime entry is for the Add-On itself and basically just tells the system you have it active. You can ignore it because like the Power Move Subscription one, it won’t actually do anything to the bill directly - basically just has to be that way because of how the system works.

It’s a bit like with my EE account to give another example:

These Add-Ons appear as line items on my bill over there, but they’re zeroed out in terms of cost and the main reason they show up at all is just to enable the system to do what it should i.e. make the features available to me.

It’s one of those if it ain’t broke don’t fix it things!

I guess that makes sense, but it would be better if it said “FREE” rather than just showing zero cost. I’ve seen people posting on Facebook that they think they’ve not received their Anytime credits.