We relocated to the UK in1998 while our two children were

Hi, we relocated to the UK in1998 while our two children were under 18. Five years later my husband applied for ILR for all four of us. My son returned to SA in order to study for his degree. He used to visit at least every year and when his degree was completed he returned to the UK. He furthered some of his studies (converted his Law degree) and worked for another 4 years until he met his wife and married in SA and remained there. They have 3 children and he now wishes to return to the UK as SA has become a very dangerous place and there is an attack on all whites in the country. He re-applied for his ILR as he had lost it when he lived in SA. He was informed this morning that he can collect his documents and went in good faith, but unfortunately his application was rejected. What can we do to challenge this. My husband and I are getting older and close to 70's, we have no intention to return to South Africa and we were hoping for our only son to join us in the UK. Do you have any suggestions please?
JA: What steps have you taken? Have you filed any paperwork with the UK government? What country do you live in? What is your citizenship?
Customer: We have not taken any steps yet as we have only learnt this, this morning. I have British citizenship and my husband is in the process applying for it too. We live in England, my husban teaches her for the past 20 years. My husband has ILR as he applied for it on his ancestralship.
JA: Have you talked to a lawyer about the green card?
Customer: No, England do not have green cards.
JA: Anything else you want the Lawyer to know before I connect you?
Customer: No, I don't think you can assist in British emigration matters. Thanks