Sorry to hear of the treatment.

But the rules on mba.com clearly say the following.

Note: If you have questions about the following ID requirements, you must contact GMAT® Customer Service BEFORE you schedule your test appointment.

With some restrictions, as noted in the paragraph below, the following are the only acceptable forms of ID that you may use at the test center: you must present at least one of the forms of government-issued identification listed below when you arrive at the test center. The ID must be current (not expired) and legible and must bear your name in the Roman alphabet (as is used in this website) exactly as you provided when you made your test appointment, including the order and placement of the names. Date of birth must also match exactly the date provided when you made your test appointment. The ID must also include a recent, recognizable photograph and your signature and date of birth. If you cannot provide one form of ID that includes all four (4) of these, you will be required to present a second ID also from the list that includes the missing element(s). With some restrictions, as noted in the following paragraph, the following are the only acceptable forms of ID that you may use at the test center:

* Passport*
* Government-issued driver's license
* Government-issued national/state/province identity card (including European ID card)
* Military ID card

*If you are testing in Bangladesh, China (including Hong Kong), India, Japan, Pakistan, Singapore, or South Korea, you must present your passport as your identification.

*If you are testing outside your country of citizenship, you must present your passport as identification unless:

- You are a citizen of a European Union or Schengen Zone country testing in another of those countries, in which case you may present your passport, national identification card, or European identity card;

- You are a permanent U.S. resident testing in the United States, in which case you may present a passport OR permanent resident card (green card).

*If you are a citizen of Cuba, you must be able to prove primary residence outside of your country of citizenship prior to testing.

GMAT is very strict about their rules. I am sorry that they were rude to you. But they are bound by their rules.

If you satisfy the criteria set above and yet you were not allowed to take the test, you can follow up with GMAC.

I sincerely suggest you dont let this affect your preparations. Schedule it again and go with the proper ID and come out with flying colors!