I had £2.07 on my account,I bought a 69p song and you took 49p of my apple account credit and 10p from my bank account and then there is only 49p left on my apple account

These are user-to-user forums, you are not talking to Apple here.

If you think that you've incorrectly billed then you can contact 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