Incorrectly debited

Goo day, I need to understand why R800 was debited from my Account? my monthly premium is R348 as per my contract with Miway. My debit order runs on the 25th of every month in January 2023 it did not run I called your client care on the 26/01/2023 and I asked why premium was debited on this day. I was told that your system did not raise the premium but they will arrange to raise it which I was ok with it. (This was not my problem but your system issues / technicalities, I took initiative to make you aware of this issue ) during this conversation I was not told how much was going to be deducted which I assumed that it will be my normal monthly premium. Today I woke up R800 have been debited, this is ********* because I don't have R800 in account waiting for Miway,I keep enough money in account to accommodate other debit order including your premium of R348 but you guys just debit over and above your premium without any communication. Please refund my premium difference and should my debit order not been honored I to other companies. I will hold you liable for those charges charges and fees because you can not debit client over what is noted on the contract and without proper consultation / arrangement