i have puchased camera and memory card and case from them. i had mery card faulty so they ask me to send it back. when i send it back they send me lexar company which i did not ordered. so i made several attempt to change the one i paid for. they are not doing anything. what do i do?

please find receipt .
Shopping Cart (Prices in British Pounds)
> > DESCRIPTION QUANTITY PRICE COST
> > ----------------------------------------------------------------------
> > Sony DSC T300 Digital Camera 1 £181.27 £181.27
> > - Colour: Black
> >
> > Sony 4gb Memory Stick Duo Pro 1 £25.52 £25.52
> > with adapter
> >
> > Sony T-Series Case 1 £17.02 £17.02
> > ======================================================================
> > Subtotal: £223.81
> > Shipping (Cameras): £6.81
> > VAT: £40.36
> > Total: £270.98
> >