got ripped of

called islamic store to place an order. left message and a man called me back.(i was charged for the phone call on my credit card, but was never told i was going to pay for it) was charged a total of 43.81. the merchandise came to me from sweet sunnah black seed herbals po box 109 liberty, ny 12754 phone 845-292-3626. their receipt said i was supposed to have been charged 25.50. called sweet sunnah, spoke with manager and she told me he was not reputable and they don't do business with him anymore. gee, that makes sense! i would like my 18.31 overcharge back. i do not want to talk to him because if i call, and he calls back, i'll have to pay! HELP tku