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The best thing you can do at this time is provide feedback in a discussion thread (there is probably a similar one out there) about how you feel about the change, and be patient and hopefully your bank will eventually be restored back to a maximum of 60 gold bars.
i know this is an old thread, but the same thing just happened to me. I had a 60 bar piggy bank - level 7, and now only the 30 bar bank shows up, same level 7. I will never spend the same amount on half the bars. I’m on level 9587 and don’t mind buying when it seems economical.