Contact information

Last Updated: July 29, 2026

MARSTEN is an online retail store operated by ZENTARA BRANDS LIMITED.

Customer Support

For assistance with an order, product, delivery, return, refund, or other customer-service matter, contact us using the information below.

Customer Service Hours

  • Monday–Friday: 9:00 a.m.–6:00 p.m. Eastern Time

  • Saturday–Sunday: Closed

Our customer support team generally responds within 24–48 hours on business days.

Messages received outside our normal customer-service hours will be reviewed on the next business day. Calls may be directed to voicemail when a representative is unavailable.

Contacting Us About an Order

To help us locate your order and respond efficiently, please include:

  • Your full name

  • Your order number

  • The email address used to place the order

  • A brief description of your question or concern

For your security, do not send complete payment-card numbers, card security codes, banking passwords, or account passwords by email, telephone, or contact form.

Company Information

  • Store Name: MARSTEN

  • Legal Company Name: ZENTARA BRANDS LIMITED

  • Company Number: 78899970

Registered Company Address

ZENTARA BRANDS LIMITED
Unit 2A, 17/F, Glenealy Tower
No. 1 Glenealy, Central
Hong Kong

The registered company address is an administrative address. It is not a retail store, showroom, customer-service location, or authorized return facility.

U.S. Fulfillment Address

MARSTEN U.S. Fulfillment Center
10200 McKalla Place, Suite 200
Austin, TX 78758
United States

This address is used for order fulfillment, logistics, and approved return processing. It is not:

  • A retail store

  • A public showroom

  • A customer-service office

  • A corporate office

  • A location open to customer visits

Customers must not visit this facility or send products to it without prior written authorization and return instructions from MARSTEN.

Depending on the product, warehouse, supplier, or fulfillment route, an approved return may be assigned to a different processing address.

Returns

All returns require prior authorization.

Do not send a product to our registered company address, the U.S. fulfillment address, or any address shown on a shipping label unless that exact address has been provided to you in written return instructions for your approved return.

Products sent without authorization or to an incorrect address may be refused, delayed, returned to the sender, or otherwise unable to be processed.

To request a return, contact:

Please include:

  • Your full name

  • Your order number

  • The email address used to place the order

  • The product you wish to return

  • The reason for the return

After your request has been reviewed and approved, we will provide the applicable return address and written packing and shipping instructions.

For complete return eligibility requirements, costs, deadlines, and procedures, please review our Return and Refund Policy.

Service Area

MARSTEN currently sells and delivers products to eligible addresses within the United States.

For information about shipping destinations, methods, costs, processing times, and estimated delivery periods, please review our Shipping Policy.