Selling wrong products

I went to buy a pie,asked for steak n kidney ,they didn't have,I asked for Cornish they said it was ther.I explained very well to the lady who was serving me not to give me pork ,as we are allergic to pork at my place.i bought it n left,when I got home I gave it to my son...he ate it..only to discover that he was eating pork,not only that it was not well done.I took it back to the shop...they refunded me.The following day i got a call from s to say my son is sick i must fetch him.when i got there I discovered that he had tonsils.i called the shop to report this matter they said they will be in contact till today.