Putting a new ejector in without curing the problem is only going to result in frustration because it is going to happen again.
There have have been a lot of good pointers here. Find out if one or all mags is hitting the ejector. Pretty sure that is the only way it
can be damaged unless there is something very weird with the pistol.
Then fix that problem.
Until then it doesn't matter how well you clean, oil and shake a chicken foot over it!