War Stories - NOT the usual letter bug

Product: Battlefield V
Platform:PC
Please specify your platform model. PC
AMD or Nvidia Model Number GTX 1060
Enter RAM memory size in GB 12 GB
Which part of the game is the issue happening in? Single Player War Story
Which part of the mode? Tirailleur
Please select your region Asia
On which server did this happen? Constant Problem
When did this happen? (dd.mm.yy hh:mm) 24/06/2019
Summarize your bug I have completed all challenges and collected all letters and it says letters 17/17 but down right it says 16/17. The letters do not even respawn because I already collected them.
How often does the bug occur? Every time (100%)
Steps: How can we find the bug ourselves? When you finish all assignment and collect all letters but didn't received reward
What happens when the bug occurs? Letters do not respawn and it says "Letters Collected" 17/17 but down right it says 16/17, so I can not get a special melee weapon
What should be happening instead? In down right should be 17/17 and I should be able to open all the letters and I received the special skin

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I already contact EA support and they want me to report the bug here.  Letters do not respawn and it says "Letters Collected" 17/17 but down right it says 16/17, so I can not get a special melee weapon.