Unless you dispute the contents of a contract it is assumed you have accepted them regardless of whether or not you signed it. Especially if you started the course; you can be assumed to have accepted the terms under which you are attending.
However it is unlikely the employers will chase you for repayment of the fee as its often not worth their trouble. Unless of course it is a huge amount of money which they have wasted and cannot recoup. They might accept a compromise.



