Issue of Relieving letter

Hi,

I have joined a Software company 5 years back they have not given me any appointment letter/offer letter. Even till today they have not given me any offer letter. Recently I had been married, for marriage I have applied leave for 15 days. After marriage i.e after completion of 15 days I have applied leave for one more day, after that for 2 days I couldn't have attended my duties due to my ill health (suffering from fever) on the 3rd day I have applied for resignation of my job as my husband wants me to leave the job and assit him in his works. My CEO replied to the resignation mail saying the he will be giving me relieving letter in september. But when I met CEO personally, requested him to issue me relieving order he denyed and said that he is not going to issue me relieving letter and said that "You are absconding" and will issue absconding letter. When I talked to him about rejoining the company he said that he won't allow me rejoin the company for short period that is for 2 months but he can allow me for rejoining the company for atleast 1 year. Accordingly I agreed to rejoin the company for long period i.e for 1 year and asked him to have an agreement for 1 year period he denyed to sign the agreement and said that I won't give any agreement to you as you are experienced, you can join the company without any commitment from our side. The company has not issued me any offer letter/service conditions even till today it seems the company has no service conditions at all even though they don't have any service conditions they are making me trouble by not issuing relieving letter and not allowing me to rejoin the company. What should I do?