It doesn't sound like anything's broken, it sounds like the scope has shifted in the rings, as you said "they are not straight up and down anymore", which won't effect your accuracy at short ranges, but if there's long ranges (more than 100 yards) you're going to be off some.
You can loosen the ring screws until the scope will turn, either 2 or 4 screws that hold the two halves of the ring together. There are numerous tools to help you align the crosshairs, but when I do this job I just square-up the reticle (crosshairs) by looking at the center of the reticles and let your eye follow the bottom crosshair down and make sure it is centered on the back of the bolt or receiver. If you need help doing this job, take it to your local gunsmith, he'll be able to square these up for you and boresight it.
Hope this helps, Mark the Gunsmith
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