Covid-19 Antibody testing at Clicks a waste of money!!!

As a healthcare worker with a previous confirmed Covid-19 infection I had my Covid-19 antibodies tested at one of the SANAS accredited laboratories in town. The test showed a high titre of Covid Antibodies. Less than a week later my wife and children decided to have their antibodies tested at the local Clicks Pharmacy, I should add they they were also tested positive for Covid-19. All three of them returned disheartened when the antibody tests were negative! As I knew that I had high number of antibodies, I tested at the same Clicks pharmacy on the next day. Again the result came back as negative for antibodies. I informed the clinic sister about my result the week before and she said there is nothing she can do about it as the testing kits are bought by Clicks. I honestly feel that the general public pays R150 per test that is quite useless as I should have tested positive (I have proof from a laboratory with the titre of antibodies).