WATCH OUT FOR THIS SCAM (FRAUD) ?

i advertised a watch on here just a week ago, thought i sold it to someone who goes by the name of AMANDA STACKHOUSE! sent the watch away and was supposed to be credited with 300pound in my account! she then said that she overpayed me by 200pound so that was 500pound thats she said was PENDING IN THE BANK OF AMERICA to get transfered into MY bank! but i was to refund her the 200pound BEFORE she credits my account with my 300pound for the watch! i still havent recieved my money, been in touch with the police! TAKE EXTRA CARE WHEN SELLING, AND DONT SELL ANYTHING TO THIS PERSON!