Quality of goods not as advertised. False advertising

I just bought a boerir and Egg breakfast bun. When I asked why there was no onions on the bun, I was told they only put 7 or 8 strands of onion on the bun. Why am I paying and not getting what I paid for. This is false advertising and the pictures show onions on the bun. What I have see is big corporations exploiting people and not getting the quality we paying for.