Nexus 6p stuck at no command

Hi sorry if this has been covered already had a look and couldn't see anything.

I have a nexus 6p and the other day the up volume button got stuck down but wasn't an issue but my phone died and when I restart it it opens in 'nwqo command' because the phone thinks I'm holding power and up volume.

I have tried holding power and down but this takes me to another similar screen but the down volume button does nothing I presume because the up volume button is stuck?

Is there anyway around this? I was quoted £175 to get this fixed in carphone warehouse considering I paid £200 for phone seems ridiculous.