requesting official information

In the past couple of months I have sent off two OIA requests to a certain government department.

The first one was not answered within 20 working days and so it went to the Ombudsman. I eventually got a response after 20 days but it wasnt sufficiently answered - i asked them to re-answer two questions and a week later they did - which begs the question, why didn't they do it earlier.

Now my second request, due today, from the same organisation didnt arrive , despite a written reminder last week that it was to be due today (Wednesday). It is now late. I got a call from that organisation today at 4:30pm on my home ansaphone (not my cellphone when I would be more likely to answer it) with a message stating that there is a delay and I`ll get it as soon as possible. I have no idea why there is a delay because the organisation's representative didnt bother to explain that on the message, and I have no idea when as soon as possible is. It is now with the Ombudsman because that phone message breached S15(a)4 of the OIA.

Why do government departments have such a blatant disregard for the OIA and is there anything other than complaining to the Ombudsman that we can do about it?

Have a guess which organisation it is. It wouldn't be hard.