****** of Micro loans

I once Took a loan at this particular company. R500 which I had to return as R760. they deducted the money. when I requested a paid up letter they advised I owe interest on the Months I defaulted which I understood. the Month of december they deducted R760 instead of the R330. Been emailing and calling with no response. Their Line just rings and goes to voicemail. I tried to stop the debi -check at Capitec. I was informed They cant stop it has to be them