It's always been the 17th regardless of what day you signed up on. Did you carry your posts over from June or did you mean July?
No, I mean June. I forgot to do the 2nd form before the 17th July (I didn´t have 30 days enrollment by then anyway as far as I can remember), so I did it later.
Again, I see no clear indication as to the deadline for submitting the form in the OP.
You don't have to have a minimum of 30 days enrolled on this one and it's always been the 17th to collect payment and start again as far as I'm aware. From the OP: Payment period will be the 17th of every month, please allow up to 48 hours for payment.
so, if i don't collect payment the 17th but 18th, shoud i have to wait until the next month?
I've got the same problem but I send Stunna a PM about this before the 17th of this month. I was away a couple of days for my work and I had no possibility to collect the payment. I came home yesterday, the 18th, but I still submitted the 'collect payment form'. Note that even if it's the 18th in your country, it still may be the 17th in another. I think there is some kind of marge for this. However, if you don't receive a payment, just send Stunna a PM to Stunna in order to solve it.
FYI: I don't have had any payment yet (for this month), but Stunna mentioned that you must allow up to the 20th of the month to receive a payment. Let's wait another day

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