Very bad experience - Final settlement amount not yet received - Senior Software Engineer FIS Employee Review

It's been 65 days I have quit FIS and still I have not received my final settlement amount. No one picks the toll free enquiry number. When I mail the concerned team they reply saying that it is being delayed by the chandigarh finance team. Also an amount of 20,000 INR has been deducted citing as joining bonus deduction. Good that I checked it and reported back to them. They are like it has been deducted by mistake and will be credited later. How can one make such mistakes? This is highly intolerable. I am not sure how many more days they would take to do the final settlement. Worst experience ever :(