Zendesk

Do NOT use zendesk for website chat, sms and phone. The software interface is not user friendly and looks like it was designed 10 years ago and never updated. We spent multiple hours trying to get it setup as there was very little help/tutorials available.
Voip calls have significant lag when answering the call and overall call quality is very low.
You cannot send an sms to customers in any simple way.
There is no mobile app for answering calls so EVERY phone call must be answered at your desktop.
When I requested cancelling today they screenshot the contract saying I have to give them 30 days so will bill me for another month.
Ironically their website support is slow to respond.

We have changed over to Coax app. So much better for about the same cost.

If you are a Shopify store owner, I would recommend giving Zendesk a try. It is a free app to install and use for 14 days, so you can see for yourself if it is a good fit for your store.

Zendesk claims to offer the 'world's best' ticket management system, but it undeniably has the world's worst customer service, the slowest response times, and never solves any issues. It's really terrible!
Zendeskは「世界最高の」チケット管理システムを提供していると主張していますが、それには間違いなく世界最悪のカスタマーサービス、最も遅い返信速度、そして問題を解決することは決してありません。本当にひどいです！
Zendesk afirma ofrecer el 'mejor' sistema de gestión de tickets del mundo, pero indudablemente tiene el peor servicio al cliente del mundo, los tiempos de respuesta más lentos y nunca resuelve los problemas. ¡Es realmente terrible!
Zendesk behauptet, das 'beste' Ticket-Management-System der Welt anzubieten, aber es hat unbestreitbar den schlechtesten Kundenservice der Welt, die langsamsten Antwortzeiten und löst niemals Probleme. Es ist wirklich schrecklich!
Zendesk prétend offrir le 'meilleur' système de gestion des tickets au monde, mais il a indéniablement le pire service client du monde, les temps de réponse les plus lents, et ne résout jamais les problèmes. C'est vraiment terrible !

Tínhamos as informações disponibilizadas do contexto do pedido do cliente sem custo algum, que desapareceram a partir de uma atualização e quando solicitamos novamente ele é cobrado pelo Shopfy. É um absurdo isso. A zendesk deveria continuar a nos disponibilizar as informações básicas do pedido do cliente.

I installed it to find dead ends to onboarding, and a reluctant support culture that is evident. There's also a superiority complex, "we're the best!" when it is not. I deleted it after an afternoon of research and trying. Hope you have better luck than I did!