There are specific promotions in game that are for a limited amount of time. In most cases if you fail to achieve all the currency you need to purchase a pack (such as in this case with the Super Bowl rings) our staff is not able to refund those for players that did complete it in time. The Madden team is exceptionally vocal on Twitter with details around promotional deadlines and link articles explaining the programs. If you see any new promotion in-game there should be more information surrounding it on Twitter.
https://twitter.com/EASPORTS_MUT
https://twitter.com/EAMaddenNFL
Muthead is also an AMAZING fan site where you can search for items and read up on the latest content too.
https://www.muthead.com/
Although we couldn't help you out with this specific request this time, we still use experiences like this as feedback by passing it along to the development team to let them know why type of promotions like this can be changed in the future to assist players under similar circumstances as yourself.
Thank you for playing Madden 19 and we appreciate you taking time out to express your feedback.