SPAR ACRES SOLD ME ROTTEN CHICKEN

I bought chicken bones from them, i bought it the 16th and the sell by date was the 19th of Febr, after up and down via email with their customer service they finally decided they will give me double the price of the chicken bones because i told them it's not worth my time and effort and money that I would give out to return the items. Today I went to the store to return the item then the store manager took his time to attend to me, so I left the chicken bones and my receipt but I made sure I took a photo of the chicken in their store and my receipt and I left the store. I just don't have the time to stand around and do nothing. I receive a Social Development Grant and can't afford all the traveling cost, I had to take anxiety pill while waiting on the store manager just to stay calm. And that because they sold me rotten chicken and when I emailed their customer service again, they told me that the matter has been excelated