Hiya @mouse12mat (Ian)
The billing system is a strange beast as you will see nearer your Actual bill date.
Your First Real Cuckoo Bill will always be the most expensive as it will be the days left in your Go Live connection month 16th April 2021 → 30th April 2021 then the following Month 1st May 2021 to the 30th/31st May 2021. (If there is one)
My billing date is around the 22nd and the payment comes out on the 25th but it’s still rounded up to the 30th/31st.
There was a few initial early issues where the billing system didn’t generate the Connection Charge Invoice but im glad to hear that it is being generated now correctly.
Then from each month on it should just be the flat fee as set out on the billing date plus any additional charges such as any calls made if any etc.
You should also get emails from “Go Cardless” and “Cuckoo” when your invoice is put onto your online account.
Below is snapshots of how I see my bills.
As you can see on the second screenshot it’s slightly higher at £33.48 as there’s call charges been added to this bill of £3.49 but other than these this is how the bill will look on your dashboard going forward.
I did notice scrolling down my dashboard this morning that there was a Billing Due Date of 24th May same as you did even though I know it’s wrong for me.
however I’m inclined to ignore this myself and just blame @afenton90 (just because I can )
I do recall that on the journey timeline when the connection is being setup that the last date on this non movable timeline did actually have the correct billing date a month after going live.
However I can just guess this is when they want the money by rather than the next actual billing date as i’d be pulling the customers Actual Billing Date info on the system but I can’t see where the system is pulling this date from so as @dan is the one who spends a lot of time on this side of things it’s worth asking for his view on this.