Last week I received an email with a job-offer from a company; since I haven't heard anything about said company, their webpage was in maintenance and found nothing about them in Google (and there have been cases in which companies kidnap or rob people by offering fake jobs), I asked them if they could provide more information about the company (expecting a "we develop X and Y and we are located in Z"). Apparently the "I haven't heard about the company" offended them because they only replied that they are "a software and hardware development startup, and we haven't heard anything about you either".
I only replied apologizing if I offended them and wishing them good luck.
Was I wrong? Was I offensive? Isn't it normal that people doesn't know them since they are a startup? Is it a professional way for they to respond? How could I've asked for information without offending them?
(Feel free to correct my grammar :) )