What's in a name?? A LOT when it's YOURS!!

My last job, within the first year (of 25) I had abbreviated my name out of self-defense.  Had this
conversation today, and last week, and the week before that ...

Me: Hi, this is BetteJo calling from (lalalala).  May I please speak with So&So?
Other person: Sure.  I'm sorry, you said your name is Bette?
Me:  Yes well, BetteJo, actually.
Other person:  Okay Bette, hold on and I will find her for you.

Will someone explain to me why, when I give my name, when I even give it a second time - specifying that it is actually different from what the person is calling me, they STILL shorten my name????

With the new job I thought, okay, I will give my real name a try.  We will see what happens.  I mean - with kids being named things like Apple and Bronx, how hard is it to get someone to say BetteJo?

Pretty doggone tough, apparently.  So apparently I have to go back to -

Me:  Hi, this is BJ calling from (lalalala) ....

ARGH-H-H!!!