iphone 6s forced calendar syncing, instead of wired itunes syncing

I had a iPhone 5 IOS 9.02, working with mac-book pro OS mavericks , all up to date, I would sync my contacts and calendar events via wired connectivity in iTunes 12.3..all up to date, worked fine, no issues, BUT, over the weekend I bought an iPhone 6s, and was not able to sync calendar events anymore with wired connectivity in iTunes, although I could still sync my contacts without an issue !!, I want to keep my calendar events and contacts between mp iPhone and mac-book pro.. Apple please remedy this, forcing people to use iCloud is simply not acceptable to me and I'm sure a lot of people who want to keep private their information..PLEASE FIX THIS, it has to be an IOS issue or maybe the iPhone 6s hardware !!