@Ken****
, Hmm, :/ It appears you were told wrong, all immigration offices add the 30 day extension to your existing admitted until stamp.
if in fact you held a 6 month METV and were two weeks from the "enter before" date on the visa itself, all you needed to do was exit/re-enter the country and you'da gotten another 60 day admitted until stamp.
I think they were telling you there was no sense to give you a 30 day extension because your VISA was still valid for another 60 day entry IF you'd have exited/re-entered the country.
I stand by my advice, they add extensions on to the date your current stamp expires.