Ethiopian Airways - Never again!

We booked a flight with Ethiopian Airways online and got our booking reference etc. At the airport we were told to book in online which took us (with our baby!!!) almost two hours and at the end it did not work. At the check in counter we were then told to pay an extra R 900 for taxes which were not paid. How is that possible? How can we get a booking reference after paying with our credit card? All of a sudden they wanted another money from us. The ground staff in Cape Town was extremely unfriendly and not helpful at all. They send us to the ticket office to pay the money. They were joking to each other about whatever and told me in between that I need to pay the R 900 cash. I did not have the money in cash and offered them to transfer it but they insisted on the cash otherwise I would not be able to fly. Very shortly before check in ended I was standing there with my wife and baby willing to pay but they were just making jokes at the ticket counter. I then changed my US Dollars which were supposed to be for our visa fees in the country of our destination. I was then told that I should rush to the check in and they would give me the invoice for the extra R 900. I never ever saw this invoice and know that I was just cheated. How can one get a booking reference if I would have not paid in full? Everything was on their system but it seems that the ladies needed some extra money. This was at Cape Town Int. Airport. Furthermore we were not sure if our ticket for our return flight might need a name change as my wife changed her surname to mine after we got married. I sent emails to the offices of Ethiopian airlines in our destinations, Dar es Salaam, to Johannesburg and Cape Town but had just no reply at all. All in all we sent out emails to about 13 mail addresses whom we asked a simple general question but nobody rep****. I never experienced a worse service like that. I asked the Cape Town office of Ethiopian airways before we flew what the procedure will be if my wife gets a new passport at our destination in Tanzania. Their stupid answer was that they wanted to know the new passport number!!! How do I know it before applying for it? After arrival in Tanzania our return flights were cancelled. They just booked us on a flight two days later without asking for our go ahead. Who pays for a two days extended stay in Tanzania? I tried also here via email to get another flight a day before we were supposed to leave but got no reply and assistance from Ethiopian Airlines at all. We finally managed to change the booking as we walked into their office in Dar es Salaam after a long and stressful drive to them. If possible we will never fly again with Ethiopian Airways. The on board service is absolutely great and the stuff very friendly but the ground stuff at the airports in South Africa and their agent ESky is absolutely useless. It is just a waste of time to write to them and to expect help for problems which were not caused by us but caused by their own airline.