I have a bit of knowledge that may help you understand why your resume may not have been reviewed. since I previously worked there. At one point, they maintained 30K plus resumes so make sure your resume is very specific to a job. Once your resume is submitted, I'd suggest calling a few days later and see if you can speak to someone in HR. Also, because of the large number of resumes they receive, the database is purged something like every 6-9 months.
If you're open to working for other insurance companies, I believe The Hartford and Nationwide have offices in San Antonio.
Best of luck in your job search.