I have used Haxsync for some time,

https://play.google.com/store/apps/details?id=org.mots.haxsync

I have used Haxsync previously.

https://play.google.com/store/apps/details?id=org.mots.haxsync

There is also an xposed module which I now use instead, called XFBSync. This does all that Facebook used to by itself, like syncs profile photos, and phone numbers.

If you are able I would give that a go.