I heard that even though after completed 4 years also we didn't received designation change and hike it depends on manager. Is it true

What was ur current grade?

Yes .. i am on same level of ASOC frim last 6 years

Fight to them after 3 years then you will get.

They can't give promotion to every employee. You have to meet the criteria required by your project and not get C rating in appraisals. Ask your manager what is the criteria and if you will be eligible in the next promotion cycle