HDFC Bank — assured loan amount vs approved amount

I am writing this to HDFC bank With great dissatisfaction. I needed personal loan of 8 lahks and check my eligibility multiple times with your executives. Only after that said, I have the eligibility, I started with the process. I needed the funding very urgently (latest by end of this week). They agreed on it based on eligibility check. Today morning I received a text message stating loan of only 3, 86, 000 have been approved. This is just annoying. Being a reputed Bank, this is not the way you should be wasting ones' time and cheating by providing wrong assurance. Based on multiple discussions for eligibility criteria, applied for the load else I would have gone for other Financial institutions. I would like this to be escalated mainly because of 1. Wasting my time, as I needed the amount very urgently.
2. Providing false assurance and misleading .

This leads me to a very difficult situation, as I needed the amount for my admission by end of this week.

I strongly condemn this and would need a clarification for misguiding me and making a wrong impact on my career.
I would request, not to do the same mistake with others as it is very important to be transparent and ethical.