Allowing your customers to contact you via e-mail is standard. In some cases, it makes better sense to have a call with them to address their issues. Callmaker can help with that. It allows your customers to request a callback from any page. Even after-hours calls are handled.
Callmaker lets you listen to call recordings and analyze calls through different marketing campaigns. After-hours callers will be able to request a callback for the next business day. The system automatically takes care of the rest.
You can try the plugin for free but for social media integration, landline extensions, and other features, you will need to pay.