You may be able to take court action or appeal against the bailiff's action. This depends on the kind of debt you owe and what has happened. You should seek advice from a Citizens Advice Bureau, an independent advice centre, a solicitor or a law centre before going to court - if you lose you may end up paying even more than the original debt.
You may have to pay a fee in the High Court or the county courts. You can get details of this and what to do if you cannot pay all or part of the fee from any county court office.