Hi Jamez,
We've just checked into this for you and can see that your Booster Pack purchase was successful and your upgrades are ready to be claimed!

If you have already tried pressing the "refresh purchases" button in-game and re-joining then it is likely you have linked your ZARP account to the wrong Steam profile. Currently your account is linked to this profile: steamcommunity.com/profiles/76561198183783101/ If this is not correct, please let us know and we will get this updated for you straight away.