THE PETROL ATTENDANT WONT GIVE BACK MY PHONE

On Thursday 16th July 2015, i went to pour petrol at the Engen Garage in MId Ennerdale.I had a new garage card and I wasnt sure that it was linked so I asked WALTER (PETROL ATTENDADNT) swipe the card 1st but he said the speed machines did not work. He said that I must pour petrol first and he will swipe the acrd after. I explained to him that the it might not go through but he poured the petrol anyway. The card declined . I WAS VERY ANGRY BECAUSE I TOLD HIM THAT THIS COULD HAPPEN. I said I dont have money on me and that I will only get paid on the 20th but I will make a plan to give him the money the next day(Friday). He said I MUST LEAVE MY PHONE WITH HIM AND HE WILL GIVE IT BACK TO ME WHENEVER I COME BACK TO PAY. He took my two phones . I came back on Friday as promised and he was not there . He left the phone with two ladies working at the store. I told them that I will come back on Monday after work and give them the money.The lady showed me the phones and she said its fine, I can come back on Monday.<br> When I came back on Monday, WALTER GAVE ME SUCH AN ATTITUDE AND SAID HE SOLD THE PHONES FOR R200.HIS MANAGER SAID HE KNOWS THAT WALTER HAS THE PHONES BUT WOULDNT GIVE THEM BACK