Terrible service from Standard Ban****!

SO I have taken out a loan 11 April 2018 for 24 months. I have now contacted Standard bank 34 times regarding this matter and still it has not been resolved. They are still taking money off my account. WHY???? 24 months and not 30 months? Spoken to various people, left many complaints, still no answer. Have the statement which says the account has been fully paid and shows that extra money has gone off, 30 July another debit order went off. Why are this not being addressed as urgent and important? I will never advise anyone to take out a loan as the staff of Standard bank does not assist a person and since I started phoning in March , 5 MONTHS LATER and still not resolved!!!!