• Employer demanding for notice pay and recovery

I joined a company in Gujarat on 1 Oct 2016 and left company on 20 April 2017 (worked for 6 months 20 days),I was on leave when i resigned,i sent them a mail on official id that due to my family conditions i was unable to join my duties again.Then few mails exchanged between us then in last mail i explained them that i am really unable to come,there was no reply from there side after that mail.Then on 6th June 2017(after approx 45 days) i received a letter from company by registered post that i have to pay a recovery amount of 43540/- and there was no breakup or details of that amount attached with the letter,so i replied them and ask for the details and breakup of that amount by mailing them on official mail id on 13/6/2017.Then they sent me the details on 13/6/2017 asking for the three months notice pay and recovery in salary of April month,the full & final sheet was signed on 13/6/2017,the same day they sent me the details but i received the recovery letter on 6/6/2017 which reflects that they prepare the sheet after i asked for details.
Then i replied them of 16/6/2017 that i am not liable to pay three months notice pay as i was in probation period.According to the appointment letter Probation period was six months but it was also written in appointment letter that"Unless a order in writing confirming you probation is given,you will be deemed to be on probation even though you have completed your probation period".The letter of confirmation was never issued to me by company.Then they replied that according to them i was a confirmed employee and they gave me all the facilities of confirmed employee.which was a lie as till the date i was working there i was not entitle to any leaves and they also forced me to work on Sundays without any extra pay or compensatory off,they deducted my salary for every leave i took.Then i got a call from company's advocate on 17/6/2017 and we settled on one months notice pay.Then on 1/7/2017 i received new full & final sheet with one month notice pay and they also deducted approx 12000 from my payable salary.They also attached two bills of fuel in which one is signed by me for recovery these bill were not attached in previous sheet.
So i replied then and ask proof for recovery amount & my salary slip for April month.Then they replied that if i want to see the proof & salary slip for April month i have to come to their head office in a week otherwise they will understand that i am not interested in full & final settlement and will take legal action.
Then i replied them that i can not come and again asked for the proofs as i do not believe them now and can not take risk of going to their office.
Now till date i do not received reply from their side.
In my knowledge they have only signed proof by me of 5000+2800
What should i do in this situation?