Most embarrassing experience at lovisa somerset mall

This morning while going to buy a gift at Lovisa somerset mall. I entered the store and there was only one sales person, I got the items I needed, I got to the till and was being ignored by the sales consultant while she was searching for something .the customer she was busy with told her to assist me as they were still looking and I was ready to pay ,she turned her back towards me and said " I'm helping this customer "..I asked if could pay and go since I've been waiting and it's clear that she is just searching for items still ,she then turned towards me at the till and told me I did not need to speak to her that way ...I was shocked as I was assertive but not rude and in no way did I attack her. She continued to exchange word with me trying to make me understand that she thinks I was being rude ...do Lovisa train staff to attack customer and to exchange words with them ? I was not Rude and felt very embarrassed by this consultant who spoke to me like that while there was other customers instore...this experience was horrible