Hello!
We are able to send through any items if there is an issue with a purchase and fix the issue causing the purchase issue. In the instance of the current Campaign Weapon, it is currently in your account data and once the fix is released it will appear asap!
From there, if we are unable to get the item to you and you are after a refund, these are handled by the platform directly.
The screenshot above is one part of Google Play’s refund options, for complete information on Google Play Refund policy and the links for the other platforms are here;
Apple Support: Contact - Official Apple Support
Google Play Support: Google Play Help
Steam Support for a refund here: https://help.steampowered.com/
PlayStation Support: https://support.us.playstation.com/
Xbox Support: https://support.xbox.com/
Nintendo Switch Support: http://support.nintendo.com/
Update to this, the fix has just gone live