Procedure in case Employee is not adhering to terms of company

Dear Sir, My firm (Pvt Ltd) had hired one of the employee and given him some terms & condition like misconduct during work, non adherence of order of management, etc before joining. He signed and stamped all terms, but after 15 days he suddenly left the job in between and rudely asking for salary of 15 days. In our contract it is clearly mentioned that if employee doesn't give prior notice/ misconduct during work we will not pay salary. Pls advice what we can do in this case as the employee is approaching police and police is harassing us.