unhappy customer

Guy I bought a tswana methodist hymn book instead of a southern sotho methodist hymn book on the 29 Jan 16. On the 6 Jan I tried returning it. They said the 7 day policy has lapsed since I came on the 8th day. What am I suppose to do with this hymn book that Is not of use? The manager just stared at me without having to give any solutions or at least apologised for my loss. Manager without clear communication and problem solving skills.