Jamaica Ave Designer

I bought a pair of pants from this store that didn't have a price tag on itI asked the store representative the price and he told me $30, but I told him that was too much and asked him to sell it for $and he agreed,he said sure that's fineThe pants I had on were torn so I changed into the ones that I was going to buy, gave him my card and told him to ring it upThe man then tried to sell me a belt as well but I told him I didn't want it because it was too expensive, so tried to convince me telling me that he already gave me $discount on the pantsI told him I was in a rush and I just wanted to get the pants and leaveI signed my receipt and ran out but didn't notice till an hour later when I looked at my card balance that I was charged $I came back to the store to address the issues but the representative told me that he doesn't care, I already signed it, and that I should call the police