Debit order

Fnb since covide19 they come up with this new rule that they don't do Reverse payment so that we can get the money relive(loan) from them. Since last month (May) I have been getting a debit order of R1401.85 that I did not authorize. They don't want to Reverse it since in May and now is June. Now is R2803.17 they don't want to Reverse it. Now because of this debit order I having minus in my account.