Watered down hot chocolate

I purchased a hot chocolate from the Mugg & Bean in Musgrave center, paid almost R40 for the drink and it tasted like water and chocolate flavouring. I went back to the store to complain and asked for a refund, they made me another drink. I once again said I want a refund and only then did they give me my money. One would expect more from a reputable brand like this...