I have recently placed a bet at a advertised price of 12/1 and my bet was confirmed at that price.Later on i was called and told that this confirmed bet was to be rejected because an error had been made on their (bettingworld) part.

From my understanding once a bet is placed it is legally confirmed.Basically i bought a product that was advertised but did not recieve the value that was due to me.

How can i get my value?