Sales people on the phone

Do you know them people who phone
you up every night just as you sit down
to eat your evening meal,I got one last night
who wanted my son,He said good evening could
I speak to Mr M Collins,I said no pal he is not in,
He replied When would be a convenient time to
call back,and I said "When he is in,"
and he hung up on me,
you just can't help some people can you