Jose wrote:
I really wished that I could have pointed out that if he'd been a bit
more
careful with his pronounciation, I would have acknowledged his first call
immediately


You could take the reverse approach of the controller asking the pilot
to call the tower. You could have called the tower after the flight and
pointed it out to him then, off freq.

Good answer. On the freq, you can just say "please give me your phone number".