Reminds me of the story of an avid English learner who, after months of
learning, decides his English is finally good enough to go to
McDonald's for a burger. He places his order and the girl behind the
counter goes "foheatogo?" He smiles apologetically (sp?), she repeats
"foheatogo?". This goes on five times with her being too dumb to phrase
the question a different way (a typical behaviour).

No, he was too dumb to understand what was being said. It's not her
obligation to phrase things twenty different ways in the hope that he'll
catch
on, it's his responsibility to be competent in understanding the language to
begin with.

Blanche wrote:
No, it's NOT the customer's responsibility to understand nor comprehend
poorly enunciated jargon.

I agree. I've never understood places of business that *depend* on clear
communication for accurate transactions (i.e., drive-up windows, bank
tellers, or any business that is conducted over the phone) that have
people who can barely speak English in those jobs.