Rotten eggs

I bought eggs 30 eggs from my Spar in Eldorado park about 2 months back and the eggs were rotten, unfortunately I threw away my slip and couldn't do anything about it, I had to throw away all the eggs because the smell was revolting. Then on Saturday 07th Dec 2019 I bought 30 eggs again from the same Spar, to my surprise the eggs were rotten again, luckily I kept the slip this time and I was able to exchange the eggs. I am upset that every-time I have to waste my time and energy because of buying Nulaid rotten eggs. So disappointing.