Having multiple same numbers in one contact after sync with my google account I synced all my contacts from my Huwai Honor 3c mobile to my gmail account which resulted in all contacts having more then 50-60 entries of one number


  e.g: Contact name "John" 


Phone number


  "123","123","123","","","","","'....... upt to 50
You can go to https://contacts.google.com and login.

A popup of "You have x duplicate contacts. Would you like to merge them?" will allow you to view duplicate contacts and merge them. 

Hope this helps!