Unfair blocking of my account

I sold a item on Facebook marketplace, the client send his own Bolt driver to collect. Bolt collected the item but never delivered to person. He went and accused me of *****, and Capitec put a stop on my account. I have send all documents and proof to Capitec numerous times. It's been 4 days. My account still blocked. And Al this happening on myself and my son's 21 birthday. I am so upset how can they not have investigated,and gathered proof before blocking my account. Now I have to struggle with this. Yet it's a case between the person who sends the bolt to me and bolt driver.