Taco Bell offers you multiple channels through which you can register a complaint. However, it depends on what type of complaint it is. If the complaint can be resolved at the store level, then you should contact the concerned Store Manager. In other cases, you may opt any of the following ways to the complaint: 1) Call Customer Care at 1 (800) 822-6235 2) Call Headquarters at 949-863-4500 3) Visit @ Customer Care Contact Form 5) Tweet on Twitter 6) Follow on Facebook 7) Follow on Instagram 8) Watch on Youtube