Well you can simply bend it back. But bending it has weakened the shaft, so bending it back will weaken it even more. You will need to be careful. If you cannot get it back straight you will need to get a new shaft.
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No you cannot repair these. You can replace the shaft though. Although you may be happy enough to keep it as it is because it is only a cosmetic problem.
A club maker may be able to hammer out the damage internally if it is very minor and near the butt end. If this is not the case you will have to get the club reshafted.