Why does capitec call you to make arrangements for payment if they just do the complete opposite and debit the correct amount.. twice!!!

Yet again capitec disappoints.. double debited after making arrangements with them for a payment against my loan but they debit twice even though i have explained that this is my first salary in months due to the lockdown. The when you try to reverse 1 debit order on their app it says cant reverse . Now i must waste my time go to a bank or call and wait soend more money to correct something that should of never happened. Even though everyone has said change my bank i still stuck with them .. i guess i should of listened.