O2 Surprises
My balance was taken by o2 surprises

Dear o2, i topped up £15 today to recieve my free calls and texts to any o2 mobile and recieved my o2 surprise code as always. I went on the o2 surprises website and entered the code. i won free o2 minutes and when i collected them i recieved a text telling me that my o2 minutes will expire in 2 days. My £15 balance was also taken for no reason because of your o2 surprises. I would appreciate if you could tell me how to get my £15 balance back. My number is 07526501425. My o2 surprise code was TPW9TQ. Thank you. Paul.