Duplicate bank entry

Can someone please get back to me to resolve this , when I uploaded the bank statement despite ticking the box to avoid duplicates there is a duplicate debit showing on on the quickfile balance , its not a small one either
I cannot delete , I get a pink banner saying it couldnt be deleted , it only occurred on friday 19th Dec so is not in a locked period and is not tagged either
I have searched and found it in the suspense account I cant delete it at all
please advise