What Is Registrar?

A registrar is an entity that offers domain name registration services to registrants in generic top-level domains (gTLDs). The relationship between ICANN and every ICANN-accredited registrar is governed by the Registrar Accreditation Agreements (RAAs), which sets out the obligations of both parties. The RAA serves as a basis for the complaints handled by ICANN's Contractual Compliance department. 

Under the RAA, registrars are obligated to provide the following customer service related services:

Registrars must adhere to ICANN's consensus policies, such as Inter Registrar Transfer Policy, Uniform Domain Name Dispute Resolution Policy, Whois Data Reminder Policy, Whois Marketing Restriction Policy, Restored Names Accuracy Policy and the Expired Domain Deletion policy.

Registrars must timely populate Whois data.

Registrars must timely submit updated registration information to registries.

Registrars must provide public access to Whois data.

Registrars must require all Registered Name Holders to enter into a registration agreement that includes specific provisions.

Registrars must investigate reported inaccurate contact information.

If you are concerned about current service provider, you can check it via https://www.icann.org/en/accredited-registrars.