Defamation of character

I have send emails to Spar head office and no response to date. On the 22nd of January 2016, my friend and I went to Spar Old Farm road to buy items for my household. We have went to the till and paid for the items. After paying, then the manager of the store including the other of Tops stopped us and forced us back into their offices as if we're *********. Inside their offices he started to use foul language at me and were screaming. I asked and he said that we know exactly what we've done. The manager of Tops said that we stole liquor from them the previous day. I said that they must show me the video but they insisted that I can wait for the police and then I can explain. I've got furious because they were keeping both of us against our will and was busy with defamation of character against us. The lady in the office even asked the manager if he was certain about his claim that we stole something and he said yes. He then called the owner and then we met the owner later and was informed that they were wrong in their claim and he gave us R350 vouchers and apologized. I am still not happy because justice must be given for such wrong doing.