Can you share the part from the document which mentions the non-compete clause ?
Here's a discussion on why such a clause might not be valid NDA & NCA - Appointment letter
We need to read what the clause mentioned to be able to suggest you
So it is advisable to go through the terms mentioned in NDA/NCA agreement signed by you before resigning/or taking any decision
Please follow the link.
As others stated, without having details of your agreement, giving an answer is difficult.
However, from my experience, the agreement seems fair and enforceable.
The client does not (from point of the ndnc) stop being only just because they stopped doing work with that particular company.
While legal action in India may take a long time, it's not a thread or distraction you need on your head when you are trying to build a career or do good work.
In addition, I suspect your current company will put you on nasscom blacklist and make it difficult for you to find a job later.
The best option would be for your client to negotiate directly with your company to get a noc allowing you to join. If they really want you,,they would be willing to pay a small premium to the company to release you from the agreement