Wipro interview questions

I had an interview with Wipro, and during the discussion, I was informed that an offer would be released soon and that I could proceed to put in my resignation. In my previous company, there's a policy where once the resignation is submitted, it cannot be revoked. Trusting the communication, I waited for the offer. Unfortunately, I never received it, and despite multiple follow-up emails and calls, I have not received any response. Due to this situation, I lost my previous job and after one month i joined different company, don't trust these process.