Bad customer service

Fransis (supervisor) and Tk (manager) they need to go for customer service training, they are seniors and clearly they don't have a clue about what customer service. I paid for everything and didn't know that the cashier who was helping me didn't till 12,5 maize meal, the security guy checked the slip and said maize meal doesn't reflect on the slip so I must follow him, I did and she gave supervisor (Fransis) till slip, I took out my debit card then Boom fransis threatened me of calling the police, she said if they call the police now I would be arrested for this I asked her how can I ***** something as big as maize meal. I felt offended and demanded to speak to the manager and demanded an apology to my surprise the manager did not care he said he doesn't know who to believe between me and fransis. I'm sooo ****ed right now