Ok, so after buying 2 weapon slots on 2 separate weeks only to have it stay at 3 slots made me think its just a minor bug and it will resolve on its on.
But, today after buying a weapon slot, only having it extend to august and no 4th slot being added, I find it very ridiculous of this issue not resolved.
TL'DR: weapon slots don't work and just extend time limit without giving out a 4th weapon slot.
I hope this bug/glitch gets fixed as soon as possible.
Thank you.
I bought a 4th weapon slot two days ago successfully.