Extremely poor service

24 March I returned my Diesel watch to Amarican swiss due to the fact that in damps up in the inside while I am wearing it. Apparently the watch has a 2 year warranty and has to be serviced once a year. I bought my watch 2 May 2014. That means I returned my watch to be fixed before the 1 year elapsed. On 28 May I went to Amarican swiss to find out if they returned my watch yet. firstly they said if they didn't phone me it is not there yet, I said but just look anyway. they returned with my watch and said I have to pay R430 for the chronic's that was fixed... firstly the watch was under warranty and they argued with me and gave n few different excuses why I have to pay the watch. They dealt the situation with a arrogant attitude. They asked for the warranty book, but we gave the book with them on die 24th of March. Now the book is also lost. We didn't pay that R430 and now we don't have a book... they said to keep the receipt would be fine... I am unhappy for the fact that they expect me to pay and argued with me, and that they have lost my warranty book and that they didn't phone me when my watch arrived at their shop!!!