disgusted by the way the manager handled the situation

I bought a watch from them then a week later one of the hands got broken as it was still new took it back and told them I don't want the dam thing they must credit my account they refused and said I must pay for it so I didn't but now my account and the credid score is getting affected and at the back of there till slip they say if you buy a watch from them to return or exchange you must come within 14 days I did that in less than ten