My common reply to annoying telemarketers and the like:
"Hello"
"Yes this is %#$@# from @%#^^# business, are you interested in some products?
"Hello"
"Ahh, yes sir, its @$%@$% from @#%$^ business, can you hear me?"
"Hello"
"Hello, can you hear me sir"
"Hello"
(they hang up - and never call again
)