Trending @Cognizant; Back pain from sitting bad at Cognizant. Should I resign?

Got really bad back ache from these bad office chairs. Going for physio now. I had complained to my manager about this but this shitty place is not going to spend money on chairs I know.

Prepared for 3 months and gave interviews for remote companies. Now, I went to manager about resigning and he is saying that he wants to retain me and will give some budget to set up a home office and I only need to WFO 3 times a month, rest he will handle on client side.

What should I do?