Bad customer service

Today I was at Clicks in Cape Gate Mall. The maybelline promoter told me that if I buy one Maybelline product then I would get a free mascara. I was excited and said that’s awesome as I actually love and use Maybelline foundation. She then changed her words and said No, I need to buy 2 products to get the promotional mascara. I explained to the promoter that I don’t have money for two products, she then retracted her second statement and said, I only need to buy one product and as long as I come back and show her the receipt she would give me the free mascara. I was so excited. I then purchased the foundation and when I went to show her the receipt she said no I needed to buy 2 products to get the mascara. I was so upset and disappointed. I told her I don’t have much money, if she had been honest with me I would not even buy the foundation. I bought it because she said I would get a free maybelline mascara. I’ve never owned a Maybelline mascara and so I thought this would be a good save for me. I’m so upset and disappointed in the service I received. The fact that she **** to me and clearly took advantage of the fact that I wanted the mascara. Now I spent money, even though a Maybelline employee got me to buy it under false pretenses. Absolutely disgusting service