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That is a parallax adjustment. You set it for the distance you are shooting at. It appears to be marked in both yards and meters. This adjustment assures the reticle does not appear to move when your eye is moved slightly from side-to-side. Set it for 200 and look at a target at 50 and move your head very slightly side-to-side and you will see the difference.
You will need top take it to someone you specializes in telescopes and can get you the right part and install it correctly, Telescopes are not everyday items you can get parts for anywear. Try a scientific store and ask around, they may know somewhere to take it.
This can only be due to a "broken" scope. To be sure, you can put your gun in a vice (cushion it) and put the crosshairs on a fixed point. Without moving the gun, crank the adjustment knobs a good 10-15 clicks in one direction each, and see if the crosshairs move from where you had them pointed. If they do not, the scope must be replaced. If they do move, perhaps you should try adjusting the scope quite a bit more between shots. The best way to sight it in requires a helper. Fire one shot with the crosshairs on the bullseye. Then, without reloading, put the crosshairs back on the bullseye, and have a friend adjust the knobs until the crosshairs move to the ACTUAL point of impact of that shot. It is essential NOT to move the gun while doing this. This method allows me to sight any gun in with only 2 shots (and a few for confirmation, of course). Best of luck!
I suggest trying a different eyepiece first to see if that's the problem. Otherwise, if it was moved without adequate protection, there is a chance the mirror was shifted or damaged. A damaged mirror can't really be fixed since it's specs are very rigid. If it turns out to be a problem with the mirror the best thing to do is find an expert on telescope mirrors to try and fix the problem.
Are you looking set the eye relief or the focus ring?
For eye relief you need to loosen the scope in the rings, mount the rifle to your shoulder with your standard hold and cheek weld. At this point, slide the scope back and forth in the rings until you obtain a full field of view. Tighten one of the rings slightly, dismount and remount the rifle several times to ensure correct adjustment. Level scope and tighten rings a final time.
For focus adjustment (remember that you are using the eyepiece to focus on the cross hair, not your target!) loosen the lock ring and turn the eyepiece until the cross hair is focused. It is best if you check it several times by closing and opening your eye several times. The crosshair should be instantly in focus. If your eye must adjust, then you need to refocus until the focus is instant.
The two dials on the scope are for adjusting the bullet point of impact. They will typically move POI 1/4 inch at 100 yards.