Ok, so I thought that was it but no.
Now I ordered the weekend free subscription and Rabobank confirmed that the payment went through BUT I have yet to receive any type of confirmation from ns.
Like bro wtf is this bullshit.
Were the people who did code this high or something ...
Yo bro 
If you ordered Weekend Vrij on a personal ov-chipcard, don’t worry about some confirmation mail.
Instead, see your Mijn NS account for what you have.
If this is your very first NS Flex order, you need to activate it at a machine (pick up order)
https://www.ov-chipkaart.nl/en/service-points-finder
If you already had NS Flex, any change is instantly. No need to wait for a confirmation e-mail.
Bro, I checked a bit ago and I got a confirmation mail like 2-3 hours after the payment apparently hahaha, but it's ok.
I can travel back now. Finally ^^
"What you wondering about, dude? NS is totally bad at coding, that's a known fact. 
"
That's good to know. Next time I'll try to avoid interacting with ns :)
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