Warranty on 2000 Hyundai Accent

Recently, car required a valve job done by my mechanic. Sent letter to Hyundai
requesting reimbursement along with his letter detailing the problem and a copy of his repair bill. Hyundai wants to discuss details by phone, but I don't feel comfortable doing this and prefer to have the questions mailed to me. Hyundai refuses - must discuss by phone. Do I have other options to get reimbursed?

Asked by for the 2000 Hyundai Accent
Manufacturers generally require warrentee work to be carried out at a Hyundai dealer or authorized Hyundai repair facility. Had you contacted Hyundai when it was discovered your car required a valve job. I would imagine they will say "you didn't contact us to allow us to do the work and therefore won't pay." Without contacting them and seeing what they have to say it is too early to to contact the Bureau of Automotive Repair or the Better Business Bureau.