Rotten chicken

I bought frozen chicken fillets yesterday the 23rd April 2020 which had an expiry date of 01 May 2020 so when I got home only to find them off with a funny smell so this morning I took them back no question asked or apology n when I was at the shop yesterday there was chicken that was already expired on the 21st of April but still being sold so health inspectors must visit that shop before people dies of rotten meat.