Debit order issues

I have a contract with them as from 2024 April (car finance)my account is meant to go off every 15th,for the 1st few months it went ok,I changed bank and I sent them proof of the new bank, and 2months went ok but as from December 2024 I have been struggling with them,thy don't debit at all,and when I call m told different stories (system error,my account is showing 2bank accounts,money was reversed, of which i ddnt ,some wl say "we r not sure of wht happened and you not the only one affected, we wl escalate the problem and get back to you ,)of which thy never, ,so I would pay EFT,as I write now thy ddnt debit again,for May and June and I dd call for may,and ask ,and was told to do the eft again,and I told the person iam not gonna do t again,they must find why they r struggling to debit my account, then boom I got an sms saying(they have been trying to get hold of me,I must pay before further actions,I ddnt ,iam waiting foe thm to deduct in my account as per agreement, iam sooo highly disappointed in them.i have records 2prove tht I have been calling them ,and now my account is behind with one month not my fault but them