warrant repair refused

I have a pair of beats headphones. 8 months old. The extending part of the headband became loose. 2 screws have come out and disappeared.

I took the headphones back to Currys. They booked me in to a 3rd party authorised apple repairer. They contacted Apple and sent me this by email....

"I have had a chat with Apple and they have confirmed that we are unable to cover your Beats under a warrantable repair due to the missing screws. The only option we are able to provide would be shipping to Apple for repair at the cost of £189.

If you would not like to proceed, I can prepare your Beats for collection in-store."

£189 was the purchase price!!

I would have thought this should be covered under warranty!!

I have emailed asking for more detailed reasons as to why it is not covered but no response.