Wipro — reg relieving letter

Address: Electronic City, 560100

I have resigned on 14 june 2019 from wipro (I'd:288999) and have been struggling to get my relieving letter from them
I have been emailing final settlement team from 15 june and finally after a week on 21 june they replied like i have outstanding amount to be paid and then immediately i have paid the money and send them the transaction details on same day but till now i have been emailing them for updates but no one even seems to bother to reply. I have worked for 5 years in wipro and is this how wipro treats an ex employee???. I have called their customer care but they just give me some email i'd which i get no response at all. I have mailed letter offboarding team, final settlement team but no one even seems to bother. At least have the courtesy to respond to emails to former employees.