Poor quality product

I bought cakes from Boxer Nigel on Friday ,to my surprise I got the worst poor quality product ever purchased.I strongly feel that the store just refunding me is totally unfair, what about the fact that I had to drive all the back to the store with my own petrol...the store needs to compensate me my petrol...the store has a responsibility to check thier food products and ensure the food is healthy for the consumers. I will not take this loss not to mention the health risk it has posed on my family. I have driven about 23 Km to and from I want my petrol back