MobileFun exchanged the dead case without quibble and gave me credit for the difference in price between the two items.
Excellent service from this company, couldn't fault their communication or the manner in which they handled my warranty claim.
The Otterbox resurgence is a good product. Robust, well made and offers good protection for my iPhone 6s. Not waterproof like the Lifeproof Fre so I guess I'll just have to be more careful around water. No screen protector either (the Fre has one) but the Resurgence has a deep bevel around the screen area which offers good 'face down' protection.
Function buttons on the Resurgence are chunky and easy to use. they also seem more sturdy than the ones on the Fre (the sound on/off button on my Fre split after a few weeks)
The integral battery pack allows me to use my iPhone for traveling and I don't have to worry about a recharge for at least 24 hours at a time.
I change the sim over between service providers when moving around countries, that means removing my phone from the Otterbox resurgence to get to the little sim 'drawer'. It is a little difficult to open the Otterbox resurgence to either insert or remove one's phone, however, I see that as a positive rather than negative, hoping that'll prevent it falling apart in the event of an accidental drop.
In all. A good product and great service from MobileFun Cheers