I have never found it that easy to get through in the past but have the club responsive to a message left - they ring back asap.
You can ring back on match days - but don't forget that is the busiest day. We don't have dedicated office staff, but there are more people around on match days.
Kevin is nearly right - come at 2.30 and spend some money in the ground too. The owners can always be found near the turn stiles and are well known to most people.