Tech Mahindra — got a call and email stating they are from tech mahindra

Address: Hyderabad, Telangana

A week back a person called me stating she is from tech mahindra and my profile got shortlisted and said to share cv and provisional certificate. I shared to them and 2 days later i got call from same person and asked to pay a sum of 900/- for document verification as it's a small amount i paid and a day later got mail stating to pay 8100/- which is refundable at the time of joining. As i got doubt and asked them to send the mail from official tech mahindra mail i'd they didn't responded and blocked my numbers.
Mobile numbers from which i got call are 1.[protected] she is the main person
2.[protected] it is the number to which i shared my certificate
3.[protected] stated that she is from tech mahindra hr team