Disgusting service from Woolworths !!!!

I had an account with Woolworths , account number ********** ********** 74 many years ago. The account was also settled long before the due time, in fact I requested a settlement letter and settled this account early. This was way back in 2015 or 2016. Recently I app**** for something at a bank and was advised that my name is listed on the credit bureau by Woolworths. Needless to say I have been contacting Woolworths for the last 3 weeks to no avail. Nobody is able to assist me as there is no information on the system for them to provide me with a paid up letter. I have been pushed from pillar to post, one person to another, one department to another, even went through to their external collections agency yet I have never defaulted once in payment and even settled the account early. I have been given various email addresses to write to yet till today I have not received even a courtesy call or a reply via email. Can somebody at Woolworth please help.. this is really outrageous, to think that because of Woolworths, I may never get credit or any application approved on my name. What a huge institution to behave so immorally and unprofessional with the public. An utter disgrace!!!!