How do i contact instra corporation? For your convenience, Instra Corporation has Contact Telephone numbers throughout the world. We recommend that you call the number closest to your location. Our Customer Service is ready to respond to your email enquiries. To ensure we can provide you quality service, we kindly request that you direct your requests to one of the following areas.Why do i need to provide my instra username? If you are an existing customer of Instra, we kindly request that you provide us with your Instra username when emailing us, as this will help us provide you with a response in an efficient and timely manner. Our Email addresses are shown below: If for any reason you are unable to directly send us an email, you may use our online Enquiry Form.