Absolute Terrible struggle

I have been struggling with Woolworths for almost a year now. I made a payment last year 3 July 2017 via Eft and by accident typed in the Reference no (my store card no) incorrectly. I put a 1 instead of a 7 . I have been in to numerous Woolworths Customer service departments and even spoke to the Managers and Payment departments of Woolworths head office to correct this mistake. I emailed the proof of payment over several times to different emails which was given to me over the phone and in store and have paid my account in full. I owe nothing on my account but they refuse to close the account without the correction of the mistake but no one is able or willing to assist me n this matter. I have even taken my bank statements as proof and the proof of payment to the Woolworths at Ilanga Mall and they promised to assist me and help fix the mistake so i can close the account. It has now been 8 months since and i have received no assistance and no correction was made. I now still receive statements and sms saying i owe money and each month they add admin and club fees. I refuse to pay another cent for the lack of assistance and lack of service.This has been a nightmare and I will not ever again support Woolworths due to bad service.