Stupid and useless company.

I refrain from using abusive language. But this one's are surely taking me there. Last year September I changed the banking details which this stupid company must deduct debit orders from. Today they still still try to debit the same account and the new account as well. My account is left with the last installment which will debit in April that is R211.00 but I get letter of demand saying I owe two month in arrears. Who ever is going to call me must have their facts straight. Nxa