Advertising a product and then you dont get what has been advertised

<p>I bought a financial caculator, SHARP EL 738FB</p> <p> </p> <p>THe box also says SHARP EL 738FB</p> <p> </p> <p>But on the caculator it says EL-738F i Paid for what was ordered and advertised, i need to use it for my studies and its wrong? Please follow up on this and let me know? because i need this very urgent?</p> <p> </p> <p>And it also looks like it has been used it has a scratch on the display screen.</p> <p> </p> <p>Very dissapionted</p>