Yes, the thing is, I'm still allowed to do transactions (payments, withdrawals), just not with my cards. There's no suspicion of any issues with my cards. If they blocked everything, that could make sense.
I kind of agree with you on that one. If they suspect your account was hacked or your cards were compromised, they should just reset the password on your account, cancel your cards and issue new ones. That's what my local CU would do. Have you asked to speak to the branch manager or the manager of the fraud prevention department (some might call is "compliance department")?