Company didn't pay last month salary after resignation.

I worked in a Hardware and networking company for last 3 years as a Networking Supervisor, due to my internal problem a few month ago i left the job, When i ask the manager when i received my last month salary and my PF money they have told me that you will receive your all dues within a month,but till now they have not clear my dues.

As i am network Supervisor of the company the company provide me one laptop and some networking tools for work,recently the Manager call me and said that please submit your all accessories immediately or we sue against you and we spoil your whole future as a threaten voice.

When i ask for all my dues they have not answer and cut the phone. Sir please help me and suggest me that what can i do now? As they threaten me to sue against me.