What would cause my car to make a weird grinding sound pulsating noise

To figure that out, a few questions: When does it happen? Are you driving or sitting idle? Braking? If driving, how fast are you going? Is the air conditioning turned on? Are you turning?

Return to repair facility for remediation/soulition .. 'Most' reputable auto repair shops stand behind their work IF there is a problem with the replacement parts or an installation error... *Hands-on* testing (test drive) and visual inspection required... There are simply too many possibilities for successful Internet repair .. Guessing at it is moot!