Try Bontact it does cost but its a very nice chat tool with help desk features and users can submit tickets and is compatible with mobile devices. The features are phone contact, chat, adjustable colors, shapes sizes and resolution. It is a flexible tool that you can move anywhere on the screen and contains many formats and scheduling. You can keep a record of your calls, emails chats and calls. It also contains an alert bell with sounds that allow you to listen for alerts when a chat agent is available. This tool contains unlimited recordings and other features. This tool contains a free trial.
I used this chat tool for my practice site during website training and I absolutely enjoyed the many features that are offered with this tool. It is easy to use and set up.