# Account & Billing

## Account Management

- [Account management](https://one.support.dat.com/4-account-billing-84e74143/account-management-ed16b696)  
- [Customer Support - contact a live human agent](https://one.support.dat.com/4-account-billing-84e74143/customer-support-contact-a-live-human-agent-81647f5c)  
- [Invoice higher than subscription fee](https://one.support.dat.com/4-account-billing-84e74143/invoice-higher-than-subscription-fee-16c3b30d)  
- [Update your company profile](https://one.support.dat.com/4-account-billing-84e74143/update-your-company-profile-e83da8f5)  
- [User company reviews roles](https://one.support.dat.com/4-account-billing-84e74143/user-company-reviews-roles-57920ca8)

## Billing & Invoices

- [Change or upgrade my account or service](https://one.support.dat.com/4-account-billing-84e74143/billing-invoices-9664e9a1/change-or-upgrade-my-account-or-service-e34e4bd2)  
- [DAT Mailing Address](https://one.support.dat.com/4-account-billing-84e74143/billing-invoices-9664e9a1/dat-mailing-address-a4812cbe)  
- [Failed payment](https://one.support.dat.com/4-account-billing-84e74143/billing-invoices-9664e9a1/failed-payment-173993ef)

## User Management

- [Add a new user and assign them a previously purchased seat](https://one.support.dat.com/4-account-billing-84e74143/user-management-f41a4be0/add-a-new-user-and-assign-them-a-previously-purchased-se-05f1f761)  
- [Add a new user and purchase a new seat](https://one.support.dat.com/4-account-billing-84e74143/user-management-f41a4be0/add-a-new-user-and-purchase-a-new-seat-0c787870)  
- [Assign a seat to a user](https://one.support.dat.com/4-account-billing-84e74143/user-management-f41a4be0/assign-a-seat-to-a-user-a47a0e3e)

## Workgroups

- [Add a user to a workgroup](https://one.support.dat.com/4-account-billing-84e74143/workgroups-5fc34c2a/add-a-user-to-a-workgroup-dd200b33)  
- [Can I be in more than one Workgroup at a time?](https://one.support.dat.com/4-account-billing-84e74143/workgroups-5fc34c2a/can-i-be-in-more-than-one-workgroup-at-a-time-b5877058)  
- [Create or manage workgroups](https://one.support.dat.com/4-account-billing-84e74143/workgroups-5fc34c2a/create-or-manage-workgroups-f6da886f)

## Most Popular Articles

- [Customer Support - contact a live human agent](https://one.support.dat.com/4-account-billing-84e74143/customer-support-contact-a-live-human-agent-81647f5c)  
- [Account management](https://one.support.dat.com/4-account-billing-84e74143/account-management-ed16b696)  
- [Reactivate / restart my DAT service subscription or account](https://one.support.dat.com/4-account-billing-84e74143/billing-invoices-9664e9a1/reactivate-restart-my-dat-service-subscription-or-acco-fc548387)  
- [Pay for my service / make a payment](https://one.support.dat.com/4-account-billing-84e74143/billing-invoices-9664e9a1/pay-for-my-service-make-a-payment-a6a49799)  
- [DAT One for Carrier - Quick start guide](https://one.support.dat.com/dat-one-for-carrier-quick-start-guide-e203241a)