Please note that court decisions have no blanket applicability and without knowing the full case history and terms of the lease deed no citations can be referred to which may fit into your case.

Lease agreement if not registered is very much binding but for collateral purposes and it can be admissible in evidence in court also if the penal stamp duty is paid once the court impounds it.

If you being the lease copy I may render possible help. Since you are form Kolkata you may feel free to contact me at [deleted] for further assistance.

1)it is necessary to peruse agreement signed by you with PSU to advice

2) kindly clarify whether terms were changed with your consent or not?

3) if you had agreed to the changes then contract would be binding upon you

4) if client is not making payment of your bills issue legal notice to client to pay your bills

5) invoke the arbitration clause in the contract if lcient has committed breach of contract

1. The ;lease agreement is required to be perused to examine whether it is a composite contract or all the components of the contract are interdependent or have bee agreed to be treated separately. In case the performance of one party is dependent on the performance of the another party of the agreement, then the first party can not be blamed for his non performance by the 2nd party who himself did not perform as per the contract and on whose performance, the performance of the 1st party depended.

2. What was the period of the lease agreement? If it was for more than an year, then it was required to be registered to be eligible to be treated as legally valid and enforceable.