Hey D4RK-273,
While it won't do anything for events that have already been missed, again I'd definitely suggest taking a look through these steps since the payments were failing entirely, and again it may be worth checking with the bank or card company as well just to make sure the following attempts weren't flagged for security purposes as can sometimes happen after a large online purchase.
Purchase issues from this period would typically be due to that or trying to make the purchases while the event was already concluding. If the purchases having trouble were purely for Apex Coins and not the packs themselves, it's more likely the former.
Normally we'd be able to try and help troubleshoot the issues with those steps, but unfortunately it looks like by the time you encountered the issue, there just wasn't any time left before the event ended in this case.