At least in India, banks are required to pay you every day for delays to resolve major issues beyond what is considered reasonable. OP's case would likely fall under it.

It's part of RBI (Reserve Bank Of India) guidelines. The scope is expanding every few years to cover every situation.

If you trip some anti-money-laundering check, banks are legally required to freeze the account, often to close it, and must NOT tell you why.

You cannot sue someone for doing something they're legally required to do. Well you can, but you will lose immediately...

For what it is worth, I think a lot of AML is bullshit. But that doesn't change the fact it is the law, and many people support it because they assume it only affects drug trafficer and terrorists and billionares engaged in questionable activities. I heard this week that when AML checks on cash came in, the limit was 10kUSD for a cash transaction to be reportable. That was in the 70s, so the equivalent now would be 70kUSD today. That's per year. But the limit has not changed, so expect to raise a red flag if you sell a nicer end car or your tenant asks to pay in cash...

The notorious litigiousness of the US is propaganda aimed at arbitrarily limiting judgements against industries who can afford lobbyists.

Banking is a heavily regulated industry, more or less an extension of the US Government at this point

They fit in the new place in law where you are not a "state actor" so you do not have to adhere to the limits placed on the state by that pesky constitution, but have been grated state like powers and authority to more or less do anything they want to individuals without any possibility of recourse.

Binding arbitration.

Perhaps the victims can't afford to sue.