Double check that ZA is configured to allow LW.

Homecall are owned by Pipex & are known for traffic shaping. Not so sure about port blocking but it's possible. Within LW go tools > options > advanced > firewall config. Change LW's listening port to 64049 (or ports in the range of 49152 - 65535) > Apply > ok.
Have you tried connecting outside of peak hours? Give that a try.
Pipex have a FUP during peak hours.
Pipex - Up to 8Mb broadband from £6.50, cheap home phone call packages

Quite a few people have had connection problems with Java 1.6.0_01. Try this version instead. Use the JRE offline installer & remove your current Java version before you install this one.
Archive: Download Java 2 Platform Standard Edition (J2SE) 5.0 Update 11

If that doesn't help, delete LW's preferences folder when LW's properly closed. See point 3 here & also point 2 if you've used older versions of LW in the past (there could be a folder in either location).
Fixes for LimeWire
This will kill all of your settings within options, you'll have to go back through afterwards & reset things. If you're not sure of your settings, go through LW's tools > options & write them all down, so that you can reset things later.

I think your router has a firewall, can't find much info (in English) about it. It doesn't show up on the Netgear site. Have a look at the list of Netgear routers here. There might be one with pages that look the same as yours. In that case, you could try port forwarding.
PortForward.com - Free Help Setting up Your Router or Firewall
LW's listening port, port in the 'manual port forward' box & port forwarded within the router all have to be the same number.


Looks like Pipex might end up being taken over by Tiscali soon:
Tiscali takeover of Pipex in the pipeline - Broadband Finder Blog