Wrotten and expired chickens

I had a very terrible experience regarding hole chickens i bought from county fair . It was frozen hole chickens and i bought 35 boxes . When i got home i got a funny smell coming from the chickens a wrotten smell. At first i thought it was maybe just the blood that made it smell like that . I bought for myself,family members and friends. A few of us made chicken and discovered it was wrotten chickens and when i checked the dates it was 2019 dates i took pics of the wrotten ones and sent back 15 boxes that was out dated and smelly 15 boxes with 8 chickens in each box . They gave me 6 boxes back and claimed the prices went up. The 15 boxes is excluding the ones we already fried . My issue is how do u sell 2019 expired chickens in 2020 almost the end of 2020 What if we ate of the chicken and got ill. I have pics of the expired dates and pics of how wrotten it looked in our pans . Now they telling me there is nothing they can do about it . I am not leaving them like this i will make sure they never sell expired chickens to anyone and they must compensate me i drove all the way from saldanha and back to go buy it and drove again to take it back Its true what they say they dont care about clients only the money