wifi not working since both updates

I have read that a lot of people are having the same issue as me (wifi button not working - it is greyed - every since the 6.1 update and now the 6.1.1).. all I want to know is what will Apple do when I take my phone into store (I have an appointment on Saturday) ?

I have done everything; resetting everything including network settings, restoring from back up and as a new iphone, let the battery drain and try it and I have seen the suggestion of putting the phone in the freezer, but for some reason that doesn't sound very clever...

So yeah, will Apple replace the phone (I am under warranty) or will they send it off for repair?

Cheers