Original certificate and Incentives are held

I worked with a reputed corporate clinic at Bangalore for 1yr 3months. I had submitted my original degree certificate to them as per contract and received an acknowledgment from them for submitting original certificate. December 30th I had put resignation and I worked for 17days in December. Notice period is 2months i.E January and February. While serving notice period company paid only 11days salary for December month. When asked no one responded. Also I didn’t get any response for my resignation mail. So I stopped going to office and started fighting with them via emails to release remaining salary for 6days. After repeated mails and warning them that I’ll seek legal help if they still don’t respond, they responded and agreed to pay it with the full and final settlement. They also told me to complete my pending notice period and I agreed. But they were not following the protocols, clinic timings are 10-8pm, call center sent a client at 8pm when I was about to leave from clinic. I refused to take consultation because it takes 1.5hrs to complete one consultation. So next day HR manager called me and told no need to serve notice period and they will give complete settlement and original certificate back. All these happened a month ago. Now again they are not responding. Please guide me how to proceed next. They are supposed to Give me Incentives, gold coins. I have proofs in whatsapp groups.