Smart shirt shrunk in wash

My wife bought me a gift a few weeks ago, a smart button up OR Oakright XXL shirt. It fit very well and was looking forward to wearing it. My wife washed it and when I tried to put it on again it had shrunk so much that the buttons were about to pop.<br> <br> As my wife threw away the slip seeing as the item fit, I could not take it back to the shop and decided to send a help ticket to customer care (#588496). That was 2 weeks ago...I got a response which asked me questions which could be answered from the initial help ticket I sent. I responded to the answer by Justin Doravaloo (MRP Help) which was a week ago, since then I have not heard back....Why am I receiving such bad after sales service? I want answers as the shirt was not cheap and my wife is very upset at how this is being handled!