Poor customer service

I was at the Pick n Pay Musgrave store, purchasing a microwave oven. I'd been standing in the line, due to covid restrictions, I decided to stand a distance from the customer ahead of me, as she'd moved to the cashier, I'd moved closer to the toll point. After the cashier had noticed me standing there, she then put the "closed sign" on the counter, I assumed it was in reference to customers behind me as I'd been standing there. The customer wh was in front of me moved forward, turned out to be a pick n pay staff member and was attempting to withdraw cash form the till point with multiple cards. I then layed my heavy microwave on the counter and greeted the cashier. Her response was to point to the "closed sign", to which I mentioned that I'd been standing here before the sign was put out. She continued to argue, whilst I reiterated that I was here before the sign was put out. She then said "I must wait, she will serve me once she's done with her customer, I said that's not a customer, it's an employee. She went on to insist that she's a customer now, yet she's purchasing nothing, just withdrawing cash form multiple cards. The lady (customer) herself said nothing, but the cashier continued to insist that she's a customer whilst she's at the till, I then felt very uncomfortable being a paying customer and was spoken to in that manner. I left and went to another till point with a much longer line and had to wait just so I can pay for my product and leave. Pathetic servise from a recognized brand!