Stinking customer service

M a Baker and I buy my baking aid at My China store in Benoni Northmead. I bought food colouring for my cakes and the taste was off. I realised when I hot a complain from a customer and indeed its true. The taste was like they added aloe in it so I took it back. A toll woman, I believe she's a manager didn't even want to come and hear us. After I made a lot of noise she came and said "I've worked here for more than 20 years and there'd never a complain like that, and I can't help u because we don't make this things but buy so here's the number u can call them" Was so disappointed because m regular customer. Sometimes I think she mistreated me because m black as she asked of my race when called. I was angry I left it there as it was not the first time not getting helped. Can somebody please help stop that woman. I also called the sales rep from the CAKE FLORA company by the name of Yvonne. She said I was right to take it back to where I bought it, I told her what transpired she said she'll investigate and come back to me. It's been three months now and I bought another food colouring it still tasting bad now I can't go back to complain because m not getting help