Because the landlord has evicted you without first getting a court order, you need to bring what is called a “spoliation” application to be allowed back onto the leased premises.
As you clearly don’t have funds for a lawyer, you can approach your local Magistrates’ court. I know that the Randburg Magistrate’s court offers the public free help.
If your court can’t help, see if you qualify for Legal Aid. See <http://www.legal-aid.co.za/?p=6>.
If not go to www.probono.org or the law clinic at your local university.