Originally Posted by
ph-sbe
To supplement what Wannabe Flyer has posted:
There is a difference between the actual visa stamp, and the I-94 arrival/departure record. Long story short, once someone is in the U.S., the visa stamp itself is totally irrelevant.
In your case, since you got a new I-94 in the same classification, there was no need to get a new visa stamped: the visa itself was issued for the same class.
Apologies for getting a bit off-topic here, but I think this may be of interest to other folks as well. For those interested in immigration policies etc, the USCIS Field Manual is a good read:
https://www.uscis.gov/ilink/docView/.../0-0-0-15.html
Bingo. We had a non-immigrant visa. The course of study was changed, but it was still a non-immigrant visa. It was extended WITHOUT re-applying for a new visa. Hence - I say, in simplest terms it WAS ''extended". If the terminology is the problem here, I don't want to go down that rat-hole. Bottom line, non-immigrant visa(yes, I know it is the I-94 FORM) can be and was extended.