Complaint

I'm Mpumelelo Jobela, received a call on the 15th of July from Mutual Credit Solutions telling me how I'm overcharged by Absa bank. They've told me that they can reduce my monthly installments. I said I'll think about it, they wanted my ID copy of which I didn't send. Next day I see a debit mandate on my banking app, asked them to cancel it and they said they need my ID copy to cencel. They joined for me without my consent and ID, now refusing to cancel. Please anyone assist