I revoked resignation last year, manager said will give salary revision and band 2

Fool you once, shame on them. Fool you twice, shame on you. Leave before you are fooled twice. And carry this learning lifelong, that save an email confirmation for everything that is even minutely important. It'll save you someday. Godspeed.

Never take back your resignation if they dont give a written email

Well I’d say you have shot yourself in the foot with your own gun.

If your manager keeps his promises then good (which I don’t think ever happens).

Better to switch.