Phone Teklom and ask them to provide the alias service for you on their pop3 server.
It'll cost ya money, hair and your sanity to get them to understand what you mean, but once it's up, it does work.
PS. If you do this, do not let the bastards register the domain name for you, keep the domain name in your name and change the nameservers yourself. (www.co.za) - really easy to do.