Unable to return Items

I recently purchased some books as a gift for a friend, she however informed me that she had already purchased them and i should return the one i bought.

The purchase was made on Friday 27 November 2017, i returned the books on 1 November 2017 as i do not stay near a CNA store, where i was informed that CNA first of all does no returns on sale items and also no returns books even though they are still in their original pristine condition.

I am extremely offended by this as the 'Manager' dealing with this return could not show me any evidence of his claims, i waited in store for a long time for him to try and search for where it is written in the return policy and after wasting my time telling me that it is too bad and that the Return policy has not been amended yet. He there after felt the need to tell me that the books have probably been photocopied so he will not take them back.

Can someone please assist me with the information i was given as i have never heard of it before.

I will honestly not be visiting CNA Loch Logan ever again extremely bad , unprofessional and rude service for the supposed 'Manager'