Overcharged

Visited Vida at Wembley Square yesterday. Ordered a Meia de Leite at the advertised price of R22. When I pad the assistant said i must pay R24? I asked why the price on the board was R22 and she wanted R24? She explained that management demanded that customers pay R2 extra as a takeaway. I refused to pay and walk down to the Roland Street Vida. Ordered the same coffee as a take away and paid R22. There was no request to pay an extra R2 for a take away. Why does Wembley Square ask R2 extra which is not advertised? <br> I recorded the whole incident on my phone for referance. I am annoyed at the staff at Wembley Vida for trying to overcharging me. Will the owners please clarify what is the policy with respect to charging for take away coffee?