Professional Con artists

I cancelled my wife membership because they double the fee and because she was not going to gym. They confirmed the cancellation then this month deducted 4 times more the original price after I already cancelled the month before. I will never sign her up with this con artists again. I am out of the county and can't deal with this unprofessional company. How on earth must I get my money back of they can't even cancel a policy correctly. So much companies in SA operate like this. Ridiculous! Quick to take money but takes ages to give back what's not theirs.