Cognizant Technology Solutions — Delay for Offer letter release

Hi Team

I have attended plsql Developer interview from
Cognizant on 20 Aug 2022 I got call from hr on 25th August she confirmed I cleared the interview and discussed about salary package after she asked to submit documents and candidate information sheet I have submitted all the required documents, she told you will receive offer later one or weeks but till now I didn't receive offer later I called so many times and sent mails but no response. Can someone please help me what should I do further