Delay by company in clearing resignation and refusing to clear dues

i am female n working in limited educational organization from last 11 months.offer letter was not provided to me till date and only joining letter of 01 page was signed by me i have no service bond or any agreement with the org. i have resigned on 15-03-17(through email, also hard copy is given to HR department, they have receive the letter but not given the receiving on duplicate copy ) giving 1 month notice but on 17-03-17 i was told "verbally" that my services r discontinued but no written message or reliving email was given to me till today, in-spite of so many mails and personal meetings with director. they always say that we will see afterwards this is causing panic in me, that they r not clearing the status, also they are saying that we will give you nothing, like security, training amount and salary of present month, but you are free but no reliving shall be given by us. I am in great panic, is this comes under mental harassment and what should i do, please suggest.???????