Bad attitude and expired goods at Thomson Hardware

Beginning of December 2014 I went to Thomson Hardware in Sabie to buy a contact adhesive (glue). When I opened the glue at my workplace I realised it had expired (the colour had turned from creamish to brown and it was smelling bad and had lost its adhesive properties). I sent my assistant to return the glue & was unfortunately charged about R9 more. When my assistant got back, I opened the \new"container"