see my post above for what happened for the 2021 season.
for 2020 season - it depends what you chose to do during covid. there were several options that ranged from cancelling your membership and receiving a full refund to full rollover of money into 2021.
based on your ticket bank balance, it seems you did some kind of rollover, but you should look back at your records or talk to your rep to be sure. in which case, you are still owed the bonus incentives they were offering members to roll over 2020 money into 2021. You'll be able to pick that up at a home game at some point. Also talk to your rep about this.
Finally, club emails said you will be able to get a full refund on any leftover money in the ticket bank balance if you don't use it all this season. since you cancelled your membership already, then once the season is over, you should get your refund and everything should be zeroed out.