Bad chocolate experience ever (Aero)

On the afternoon of the 15 October 2017 i head over to Shoprite Greymont JHB area to get my weekly shopping groceries... So i decided to get myself a Nestle Aero dark chocolate instead of a Cadbury slab.... (me wanting to try new things). So then this evening i decide to open my chocolate but to my amaze i have been disgusted to see what is really in the chocolate wrapper..... the chocolate is all dry and looks as if there is fungi growing on it...... im really not impressed with this brand..... and would like to know on how to get my money back....