Unauthorised Debit - They do not respond via mail or calls

Cannot believe this.

I have been making use of Boost Loans since Sept 2023 to help with the thin periods between payments. I have paid each and every loan up to date as you cannot apply for new loan unless the last one is paid and i can prove it. I app**** for a loan end of March as my Loan was paid. I received my funds but then the 2nd of April, (by the way, debit date is normally around the 26th), Boost loans decided to debit my account with R2460 which is double of my repayment firstly, not the agreed upon amount , not the agreed upon date of debit. I tried to reverse the debit via my banking app but could not. I phoned the bank, they cannot reverse it because they say it was mandated. I would like to see that mandate. I don't have any funds available. Boost Loans literally took the food from my family's mouth. I cannot believe the audacity. Error or not. I need those funds ASAP. They do not respond to mails or phone calls. Very disappointed and extremely upset as I am in a crisis now.