hai,
you currently using google account so try through system -
change phone contacts google to microsoft , and try
using google contacts export to microsoft contacts import through system(laptop or desktop)
must using microsoft account for an windows devices,.
long press the google account name, it's showing sync or delete,. if you already did this , is this not work.
pls try setting -> reset .
hello bro,
windows phone only showing US holidays, not showing any other country, not having this feature in win 8.1, maybe we can expect in features update, you can enable google,facebook calender,
thanks