Bank Glitch Withdrew All Funds From My Account

I have an Health Insurance Savings account that I contribute to weekly. Last week, I used my card to purchase contact lenses. My card was charged multiple times for the 1 purchase. I learned this when I checked my account today and saw that my balance as -$11 when I should have had a few hundred.

After bouncing between the contact lense company and my HSA bank, I learned that duplicate charges were a known glitch that had impacted other customers. The customer service rep at the HSA bank did not provide an eta for when the glitch would be resolved or for when the funds would be returned to my account.

My question is this: if a bank error directly impacts account balances or access to funds, are they legally obligated to inform account holders?

**EDIT: Health Insurance SPENDING account not Savings account. My employer and I contribute weekly to this account, and I use to it to pay for medical expenses. I'm not sure if the difference between a spending and a savings account matters in this situation.