You can appeal, but playing 42% is going to be risky.

EL issues to your main GK and FWs, but you could have Stalled for example.

10 goals from 13 shots is unlucky, but a 7 goal difference has been seen before, it's just the 10 goals may skew the golden boot a tiny bit.

In summary, the scoreline looks tough on BER, but had it been 6 or 7 nil and you'd played 48% then you might have a reason to complain.