I've received multiple phone calls from my bank to discuss my mortgage Every time they call me and ask to "go through verification" - aka I give a random stran

I've received multiple phone calls from my bank to discuss my mortgage Every time they call me and ask to "go through verification" - aka I give a random stranger on the phone the personal information they need to identify themselves with my bank - so I tell them I'll call them back instead Then i call back and get bounced around through multiple teams until inevitably the call drops, I think because my mortgage was bought from another bank so it isn't well understood by customer support Anyway, I think it is legit calls I get from the bank. I hope it isn't important because i still haven't got through to them to talk about it