It is such a crying shame that the whole sacred practice of Tantra has fallen into disrepute and has become associated with black magic, soothsayers, sex and just plain charlatans everywhere. It is a real shame.
It is my life's work to educate people and make them aware of what Tantra is really all about - especially Hindus.
How to cure impotency and chakra imbalance caused by curses, black magic, spells and witchdoctors pointing the bone:
Nobody can have any power over another unless they open themselves up and allow it to happen, siddhi or no siddhi. I am a Tantra Yogi.
You need to reclaim your own personal power and doing yoga exercises like Vajroli Mudra will help:
Also, adopting a Satvik diet high in dairy, bananas and other mucous-forming foods, it will help with the production of veerya or vital fluids.
Herbs and supplements such as ashwagandha and shilajit can be of assistance here too.
...and of course, praying to the Divine Goddess for her blessings.
If you do a jal (water) fast for sixteen Mondays and get a priest to perform puja at the end of it, you can basically ask Shiva for anything you want.
The final option is to go and see a jyotish (astrologer) and get them to do a natal chart. There may be something astrological preventing this too, or you may have to wait for a favourable time to have intercourse.
You can get them to fashion an amulet (kavach) to ward off the negative influence of Shani (Saturn).
Try any/all of these things because the answer lay in there somewhere.
All the best.
HAR HAR MAHADEV!
Aum Namah Shivay