Tugsan Dedekorkut

I bought 2 water from there. Normally water is £1.50. I paid with card and he charge me 4 pound. I saw it when i check my app. I go back to him, and he said to me when you paying with card its like that. I dont care about 1 pound. But he need to tell me before. I can give him cash. He is so rude. I will not go anymore