Stale cake

Im so disappointed with checkers in canal walk ..I bought a black forest slice of cake on Tuesday lunch time and the cream was off after taking a few bites I felt off and started to have a running stomach and was vomiting. I did take the cake back and told them what happened they said I need to go to the doctor with my own money. I was so furious the doctor said I had food poisoning.We buy at checkers thinking they sell fresh quality food but it was not the case