I sent my business bank (Nat West) a statement of account for all of the phone calls and letters I had to write to them to clear up an error on their part.
 I used their own schedule of costs for letters (think it was £29/letter at the time) and phone calls (£10) and presented them with a bill in excess of £200.
 Needless to say they refused and I withdrew my accounts.
 
 Ask them for the local banking ombudsmans address and stir em up a bit.