Telkom - Ridiculously Bounced Debit Order Cost

I am very upset. I missed a Debit order payment. My Data contract is R250.00 a month. When money went into my Account which I already paid my Router acount via EFT a total of R500.00 way more then my actual payment. Telkom took almost R700.00 from my Account today. When I investigate the Consultant told me becuase I missed my Debit order Telkom charge R217.00 for a missed payment. I do not monitor my Account and I am sure this happened quite a few times and therefore I wish to lay a Complaint against Telkom. This is ridiculous. A bounced Debit Order normally cost you between R7 and R10. Who can I reached out to as I would like this to be investigated. In the difficult times we living in and struggling to keep up with payments I am lived. This is apparently in their fine print.