A contentious all-day hearing Wednesday left many Blue Cross and Blue Shield of New Mexico customers saying they see little hope for relief from a controversial 21.3 percent increase in their health insurance premiums. Even though the company’s cash reserves have now reached $7.2 billion, an expert witness for the Attorney General’s office’s, who reiterated earlier testimony that Blue Cross had not sufficiently documented its claimed cost figures, and whose analysis found the insurer’s rate filing had exaggerated company losses, said the 21 percent increase was “reasonable, given the circumstances.”