NFC not working on Samsung A7 Device - 6.0.2

[AC Question]

I upgraded my device to Android version 5.0.2 to 6.0.2 after that NFC is not working. My device is not able to DEDUCT NFC at all. I went to the Samsung Service Center there they kept my cell phone for 3 days while returning they mentioned that the issue has been fixed now. However its still the SAME!!.
If NFC is not compatible on version 6.0.2 then why didn't I received any sort of notification/warning before upgrading.That too which is an inbuilt feature.

PLEASE HELP.. !!