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Matrix is useless, don't waste your time there.
Try Launch Out Computers on Long St, beside Rossi's restaurant. Much more helpful.
Failing that, go into zero gravity beside Ocean Basket and have a word with the boss there. He might be able to point you in the right direction.
Edit: not sure what services these guys offer, but local ISP maxitec might also be worth a call, www.maxitec.co.za
You can also try Communica in Cape Town - http://www.communica.co.za/contactus.aspx
Don't forget to ask them to fit the end plugs as well (LOL - seems obvious, but I did and when I got there I got handed 20m of cable without plugs - fortunately they're nice chaps and fitted for me on the spot)
PS: Not sure if they are open over the festive season tho....