Contact information is really important on any website and any paperwork. Always show the contact information on the website, so that users do not feel alone and provide them with phone numbers and email addresses. Users will able to ask for help and be able to ask questions. It is similar to when you go shopping instore you can always bring the item back instore and discuss with staff and this needs to be provided when shopping online.
Display contact information such as e-mail addresses and phone numbers, so users can contact the business when they have a problems or generally.
Put the information in a convient and easy to find place such as in the header, on the right hand side. This way users will not have to spend time searching for the contact information.