You should contact your registrar.

If you do not know your registrar's contact details, enter your domain name in the WHOIS search box to access the data for your domain name registration, which includes your registrar's contact details.

Please note that accredited registrars sometimes cooperate with subcontractors or intermediaries to offer registration services for domain names to the public. However, only accredited registrars can access the registration systems and are therefore made visible in the web-based WHOIS. The registrar which ultimately accessed the registration systems to register your domain name is usually displayed in the web-based WHOIS. However, please note that reseller data may also appear in the WHOIS output as the 'reseller contact'.