Wonder Hearing Aids is a sham operation. Their physical address is nothing more than a P.O. Box at the UPS Store on Balboa Avenue in San Diego. If you have had difficulty with this company, report them to the California Department of Consumer Affairs in Sacramento. I know from experience that they will help.
I speak for all of the healthcare professionals that will recommend that you are fitted by someone that can diagnose your hearing loss, provide couseling, guidance and recommendations. In other words, see an audiologist and stay away from mail order hearing aids or devices! There are some excellent audiologists in the San Diego area.