
I am ready to Quit !
My manager called me in the meeting and said that from now onwards all 7 days are working because we are behind tasks. ( These tasks are irrelevant to me as these are not related to any customer development, he just wants to see how the data adds up ) Honestly I think it was the diwali week where people took things lightly and not that we are behind deadlines. He asked me to be available 24x7 this Friday to Sunday but I had already planned the weekend off with family and pre intimated this 10 days in advance. Now I'm getting calls that 'x' task was not done and 'y' customer is complaining etc. ( which is not the case ) On this break, I've finally made up my mind to quit. The mental pressure is not worth it. WHAT is a good way to put it across to the leadership??

Tell them what you're writing here, you are quitting because there's too much pressure on you. Simple.

You are giving him a way out. Why would you help him ? Company mai keyboard chle na chle dimaag chlate rehna chahiye.
Your goal: look for a job, and leave a dent on this manager.
How to do it: Extra hours should be approved by higher management and HR. He is probably bypassing them and keeping only his manager in loop and have approval off the record.( if this was on record you would already have email but assuming you dont). You want to bring it on record. He looks bad .
Ask your manager to put it in writing and mail you. Don't ask like you are challenging him . Slide it smoothly. Tell him if you get an email you will be able to show this in your performance review, and it will be helpful to you. Also, tell how he as a manager would look good that he can convince his team to fulfill extra business requirements, and this puts him in good light. Once you get that email, remove him from loop, ask his manager and manager's manager's manager if they have approved these longer hours . ( dont ask directly, improvise like you care for company and want to know how important is this) . Tell them how you well planned your holidays and staying in office would mean montery loss of tickets. ( train,plane, visitng pilgrimage, taxi ,hotels). Ask them if you could help other time.
This way the higher management, HR will know . If they have approved it, you will get to know and they will most probably allow you to go on off. Of they haven't approved your manager would also be looking for a job.
Remember don't give such managers a free pass. Dent them.
And look for a another job. This is definitely not the only your reason you want to leave. You must be having more, leave with style.

Just learned its a starup with 25 folks. Ignore my advice. Startups are not companies. You knew you will have to grind when you accepted to work there. Either grind or leave. You can't expect a startup to offer you wlb , never. It doesn't work that way. You should have known. I smell that you knew ,you were ready to draw the attraction salary but now when the real grind is on the doors you know you can't handel it. You are not startup material. You are an employee material. Startup have members. Dont mind but its the truth it seems.

Indian management is crap

Bro no job is worth the mental torture, turn off mentally on the weekend - I know it's easier said than done.
Have a back-up in place before leaving, the market is not good - not advisable to leave without an offer at hand.

Damnnn this is really bad. I hope you get out of this situation soon.

Name shame