The answer depends on the transaction type. For most crypto transactions, refunds are typically not available, as crypto transactions are irreversible. However, you may be able to resolve certain issues by contacting Coinbase support. Call the Coinbase Helpline Number +1 855 998 0300 to speak with an agent. For any issues with your transactions or account, their Customer Service Number is available 24/7. Contact Coinbase using +1 855 998 0300 for more details or assistance in resolving your refund queries.