WLY Completesave and Wowcher review: Online purchase

Unauthorised payment of £15 taken from my bank account today. I believe this to be from an online purchase on 7th Dec via Wowcher for which money was taken and nothing received. Please return the £15 and the £9.99 which Wowcher took on the 7th Dec. I will provide my account number and sort code once I receive a response. I am a pensioner and tend to checkmy bank regularly so notice items which I did not authorise. Thank you