If you can`t afford to pay the o/d back, then you must be quite hard up, so go after your charges, if you don`t you`ll keep getting hit with more and your o/d will keep growing.
They will ask for your o/d to be repaid, they did with me.
Get your first letter off to them as soon as possible (read the FAQs to find it.)
Then tell them you are disputing the account (they can`t close an account in dispute) and you will attend to the overdraft as soon as the dispute is resolved.
After you have your charges back, offer them around £50 a month or what you can afford.
They`ll probably turn that down, tell them it`s all you can afford at present
They will pass it to their debt collection dept.
The debt department will almost certainly accept your offer to repay at £50 a month. Any regular payment is better than nothing as far as they are concerned.
They could threaten court action, but any court seeing you are offering regular payments towards your debt would not be interested, especially for only £2000.
Hope this helps, remember it`s your money they have.