Incorrect debit date

my account was debited on 24 November 2017 and due to the fact that there were no funds in my account it rejected and i incurred the bank charges. Firstly, on my contract i requested the debit date is on 25th of every month and i would like for the bank charge that is on my account to be refunded as you debited me on the date we did not agree on. I was on the call with Mduduzi Ndlovu, who said a manage by the name of Nhlanhla Nhlaka will contact me, this was last week and i am still waiting for the call. I was chatting with one of your consultants yesterday by the name of Tracey asking her to ask those people to call me, even now there is no call. i just receive my statement now and it shows that i owe you guys R1237.00 which i have no clue what is it for. can my bank charges be paid back and explain your statement before i send this to the ombudsman with the previous cases that i let slide.