I bought a Nexus 6P from Carphone Warehouse that's still in warranty (just). The screen was cracked on it a couple of months after I bought it, (don't step on phone in the middle of the night when you going to the toilet). It's now developed a problem in that the battery is fubar'd, this it turns out is wide spread problem (there's a class action Lawsuit in the US over it). My problem is that Carphone Warehouse are refusing fix the phone as it's 'clearly due with the broken screen'. 
I've tried explaining the item is not fit for purpose as per consumer rights act. But all I'm getting is
.
Any suggestions what I can do other than try to go down the Section 75 on Card or small claims court route?

I've tried explaining the item is not fit for purpose as per consumer rights act. But all I'm getting is

Any suggestions what I can do other than try to go down the Section 75 on Card or small claims court route?