Wipro — selection process

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Wipro banglore

November 19th 2019 i had a interview in banglore, sarjapur in wipo were i cleared all the round and i got selected after results out they told i will be getting the offer after 26day but unfortunatly i got more than 1 and half month in between they ask my scaned all documents by mail 2wice then i sended all the documents to them. On january 17/2020 i got a mail i though it will be the joining letter but it was again interview call letter were it's clearly written face to face interview on 20th january 2020. I dont what was going on. Then i went on that date were i came to know that the last interview in which i got selected its on hold or cancle even wipro people are not replying clearly. They asked me to go for another interview same post as (Backend operations bt slightly different may be with company) i don't know what to do. Just only one thing was going on mind. Why they ask my documents if they know all thing its illegal way.