Company not paying salary settlement

I was working as Medical Representative in Ahmedabad based pharma marketing company Nextgen Healthcare from Nov 2018 to March 2018 on gross salary of 13500 and after deducting 2200 as PF, ESIC, Professional Tax , I used to receive 11300 on hand.Besides that 140-160 daily allowances on working days and 1.25 INR /kms. Reporting system was online. I was assigned Valsad HQ and used to travel different assigned territories and sell medicines.. Company paid my salary regularly for first three months and expense of 2 months.I was only given offer letter not appointment letter. There's no HR inspite of 60 field employees are working in company across Gujarat. Once I asked company about my ESIC card which I believe they are wrongly deducting and not crediting. They held my salary for month of February 2018. I waited and worked till 15 March 2018 . They kept on making me work by false commitments. Soon I realized that they are making me work in field without payment and started torturing . My money for traveling and petrol finished so helplessly I 'd resigned via email providing reason of non payment of salary. They didn't replied my email. They called me and asked to submit property like working bag, visual aid, NOC from stockist which I did. After that they started making excuses that they didn't liked my work of which they never informed me in writing or verbally. They did same to so many employees. I visited my Valsad labour commisioner office who replied that they can't do anything as company is registered in Ahmedabad. I tried to convince them that I am working in Valsad so I can complain in my city. But they denied and told me to travel to Ahmedabad. At that time I was not capable to afford advocate fee. I raised my concern on fb and whatsapp seeking for help. Now company MD is threatening me to trap into police case of cyber crime for trying to defame company name. One of their friend working in Ahmedabad police tortured and threatened me a lot on phone. Please suggest to how to get back my 1.5 months salary and 2.5 months expense allowances and bills. My amount is nearby 22-24 thousand. Kindly help.