Q: Why i have been billed six times for the same item? Pls help how to refund..

Did you change your card details on your account a number of times when trying to purchase the item, and five of them are temporary store holding charges : http://support.apple.com/kb/HT3702 ?

If they are all 'proper' charges then try the 'report a problem' link to contact iTunes Support : http://reportaproblem.apple.com

If the 'report a problem' link doesn't work then you can try contacting iTunes Support via this page : http://www.apple.com/support/itunes/contact/ - click on Contact iTunes Store Support on the right-hand side of the page, then Purchases, Billing & Redemption