Trantor Software Engineer NodeJS interview questions

Difficulty level is medium with 3 interview round. The reason I declined the offer is the way HR and management team handled my offer. Initially they offered me something else for which I said yes and accepted the offer as they had shared CTC breakup with me. But after 2 days, they said we can't offer you this and made a 30% cut to the previous offer. The reason they stated management can't offer this much as per your experience. The only question I had if it was not feasible then why they offered lucrative one in the initial case!! Thank God I didn't resigned.. it really made me feel that Trantor is trustless. Bad Experience..