Who can I contact if I have any additional questions? December 16, 2024 19:13 Updated Please contact the OTC Fulfillment Center Monday - Friday from 8 a.m. - 8 p.m. ET at 1-800-560-9712 (TTY 711). Related articles How do I check my order status online? Do unused OTC allowances roll over to the following quarter? What do I need to log in to my account? Is there a shipping and handling charge? Where can I find my available allowance?