The ferry was great. Shame I had to pay an extra 1...

The ferry was great. Shame I had to pay an extra 100 Euros because I made a mistake on my booking, still not sure how it could have happened.
Took 3 minutes to sort so that's just over 33 Euros a minute and the next ferry wasn't exactly full so no need to bend over backwards to squeeze me in.
Yes I made the mistake but honestly 100 Euros ????????????
Are you not earning enough as it is
Sorry for the rant