South Africa Law
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I'm not an immigration law specialist, but I will endeavour to give you some guidance. You should get yourself a reputable attorney who specialises in immigration law, and you can either search for one at www.attorneys.co.za or contact the provincial Law Society for a referral.
The first thing to do is to lodge an appeal against the deportation, and also file a claim under the Promotion of Administrative Justice Act (Act 3 of 2000). The decision to deny or approve permanent residency is an administrative decision. The decision to deport your wife is also an administrative decision. And administrative decisions must be made on a rational basis, and your wife is entitled to reasons for the decisions. They can not hold her accountable for actions of an unscrupulous lawyer. Only if she herself was found guilty of fraud can they use that against her.
If that still does not work, I suggest that you write to the Minister of Home Affairs and state your case.
I hope you come right.