Bad Service

Hi my name Is Themba. I Purchased stuff for my niece (hat & lego set)through my bank card the transaction was approved.manager approached the cashier as she was about to hand me my stuff and receipt ;manager stopped her,manager requested me to sign on a piece of paper so he can verify if it's really my card I was using. Unfortunately my bank card did not have a signature and i explained to him that my card doesnt have a signature because fnb sent the card via a courier company he told me I'm lying. He told me I can't have the stuff I bought, he asked for my drivers nd bank card;made copies. He told me I need to log a call. Asked him to write a formal note and sign it just so i can have proof;he refused. I left the store empty handed. I Hve never been treated/humiliated like this before . Store Ackermans Tambotie mall Randfontein . managers name:Moab.