I need feedback on experiences on African spirits being used to send magic back

I met an amazing mage who has helped me a lot so far and recently we did a return to sender spell last week for returning curses black magic with proper sacrifices and all.This is the first time I have worked with African spirits (under strict supervision).

Has anyone else done this? How quickly did the spirits manifest and what indications did you get before a result occurred.I am trying not to lust after results here but I am hoping justice will be done by nature and spirits soon as the damage to my situation has increased a lot.