Your vehicle will be put up for auction after a predetermined amount of time if it has not been picked up from the impound yard. Even more unfortunate is the fact that you will be held responsible for any unpaid responsibilities in the event that the earnings from the auction sale are not sufficient to pay for the storage expenses.
In order to avoid this, you should make sure that you pay the fees or manage to get them reduced to an extent that you can afford to pay them. Please do not assume that not paying the fees will ultimately one day realise your car.