Coinbase does offer 24-hour customer service. you can reach their customer service by calling their phone number, +1-918-708-1933 (𝟐𝟒*𝟕 𝐋𝐢𝐯𝐞 𝐏𝐞𝐫𝐬𝐨𝐧) 𝓸𝓻 +1-918-708-1933 [𝓡𝓮𝓪𝓬𝓱 𝓛𝓲𝓿𝓮 𝓟𝓮𝓻𝓼𝓸𝓷], 24 hours.