a sentence from a car forum

[Tukanja]

From a car forum, I've read the sentence below

Hey,

Just a final reminder that F*** Fair payment is due Friday latest. Any
payments after this will not be accepted unless paid by cash and over the
weekend at the very latest as the booking form is been sent Monday next
week.

Shouldn't it have been said: is to be sent on Monday next week.

Also is it possible to say this sentence below in a different way?

Just a final reminder that F*** Fair payment is due Friday latest.

Or this is the best way.

Thanks

[Joe]

What the writer probably meant is:

...as the booking form is being sent Monday next week.

Your suggested form would also be correct.

I don't see any difference in:
Just a final reminder that F*** Fair payment is due Friday latest.

[mess]

I'd think "is been sent Monday next" is meant as "is being sent next Monday"

And "Just a final reminder that F*** Fair payment is due Friday latest." could alternatively be written as "Just a final reminder that F*** Fair payment is due on Friday at the latest"

(An American writer may prefer "due Friday" instead of "due on Friday"

[Tukanja]

Thanks

but the sentence "Just a final reminder that F*** Fair payment is due Friday latest."
is still struggling me a lot.

Does the next sentence below means the same?

"Just a final reminder that F*** Fair payment is a duty on Friday latest."

Is "due Friday" equal to "a duty on Friday" ?