JKM@SA: Is there a way to just see the Customer entry w/o all the contacts?
Be default Method will show all the contacts for a customer under the contacts tab. If you're seeing 4 entries for a customer that should have 3 then there must be a 4th entry for that customer. If that 4th entry is a mistake then you can delete that contact.
JKM@SA: Why would they be there and how do you delete them?
Those contacts exist because there are contact records associated with that customer. If there are contacts that you would like to delete, click Edit Contact then in the popup, click more actions > delete contact. See here.
Let me know if this solves things for you.
~C