doll, since ur frd is unable to help you, maybe you can void the contract with her. Engage a new agent (eg. believer), and sell ur flat. if ur ex still refuse to sign the contract for the com, then i hope u sell ur flat at least not at a loss and also the buyer is willing to put a bigger deposit and also when signing the Option to Purchase Form, give another sum of money.... hopefully these amount is enuff to cover all the com for both of you.