Capitec Bank
Debit Order disputes

I feel like I am stuck between a rock and a hard place. I have a collections company NDS which is meant to debit my account with one amount, but have deducted another amount.
I called the company to confirm what my agreement debit amount should be and they confirmed and sent me an sms as confirmation.
I am now disputing this amount with my bank and they are requesting a letter from this company and this company has sent me an email to tell me they are having problems with sending the letter.
Why should I justify my dispute, why can't this company submit their agreement if there is a problem.
Why is it that Capitec Bank is taking a 3rd party's side where I'm their bank account holder. Is this even legal to do this. Can someone advise me on how other banks do transact on such transactions and how to take this forward.

Company: Capitec Bank
Country: South Africa
City: Randburg

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