Sorry if I wrote my post badly. I didn't mean random solicitation calls from the bank, I think I have opted out of those. These are related to issues like authorizing transactions, possible fraudulent charges, issues I have usually initiated but the customer rep has to call me back a few times to resolve. Still they are calling me and asking for personal id confirmation, which if they turn out to be a criminal posing as the bank they could then very easily use to phone the bank back and pose as me.
I've never tried the call blocking app. Have you had any cases where a legitimate business or friend was blocked by mistake?