Curious phone message grammar phenomenon by prospective tenants

I have noticed this occasionally for years, but it has reached epidemic proportions of late, probably 60% of my messages. I notice it when I put out an ad for a rental, and prospective tenants leave voice messages asking me to call them back. The messages go something like this.... "Hello, my name is Megan, I am interested in the condo for rent. If you could please call me back, my number is 303-999-9999" <end of message>. It isn't like I am some grammar Nazi, but if you are going to begin a sentence with 'If" then you have to end it with a responsive action, as in "If you could please call me back, my number is 303-999-9999, I would appreciate it".

It isn't a big deal, I just thought I would share, and see if anyone else has noticed the same phenomenon.