Banking Security Checks

I have a problem in general and it applies to all banking and financial institutions and that is that when you phone a bank or similar they go through a whole process of doing a security check on the premise that you have contacted the correct person and i agree with this because of all the ***** and ****s going around. However, when they phone you, you are not given the same rights as they want to do a check that you are legit. You don't know them from a bar of soap and they could just be ******** trying to get all your information. They phoned you, surely they should accept that they are speaking the the right person, youi have no security check on the caller in this case. I will not go through that unless they can prove who they are. I am writing this to the Ombudsman as they may be able to get to all concerned institutions. and it is not against them at all.