When you're so fed up with it all, you resign, but bear in mind your disappearance is always measured financially in terms of immediate client revenue loss and DXC reputation damage. The loss of you....... is never, ever about you.
So, how to get a pay rise?
Make yourself critical on highly visible work and then put your resignation request in with a "I will cancel it if you immediately promote and pay me more".
You will soon get your payrise and ironically, you'll also be admired for your business minded brain
The alternative is what most people do - Work long hours and hope it you get fair recognition next time.
Eventually, people spend too much time at DXC and so their resignation is never a catastrophic loss to DXC, The catastrophic loss is seen in their own CV.
Anyone under 45 should get out now