Kulula.com - bad service!

I have had a bad experience with Kulula.com. I tried checking in online but kept getting an error message so I called the Customer call centre. The operator was unhelpful and after 6 minutes of trying to explain the problem as she kept interrupting and was clearly not listening to what I was saying, I gave up and sent an email to ********** stating my problem checking in online. Later in the day, I received an email from Kulula stating that I have been checked in. Great service I thought until I saw the seat allocated was a window seat right at the back of the plane! It is not a seat I would have selected and have been informed that I cannot change the seat now that I have been checked in. All this terrible service and I haven't boarded the flight..... Three negatives: a) the website had a problem checking passengers in b) rude and unhelpful call centre operators c) checking passengers in without consulting about preferences