1 month in arrears bcoz of short payment and boom my name is with the Credit Bureau

I accidentally short paid my account for 1 month after 20 years of having the account and paying well ever since I have had it. I kept getting sms's and e-mail which I attended immediately and contact Edgars and have had to dial 3 numbers before I could get assistance as collections department said they could not assist and answer my questions and advise that Edgars should answer me I spoke to Winslow who promised me that this account was only just with their internal collections department but this information was not available on the Bureau, to my surprise I am applying for a bond and the banks noted this as bad credit and I was shocked as I have paid but only short paid and due to their statement not being easy to read. I immediately made payment after discovering my error. I called Edgars on Friday to request a paid up letter or letter showing my account is now up to date and spoke to Leeshane who gave me attitude when I asked for him to note this as a complaint to the relevant people. To this date I have not received that letter, so I wasted my time calling in. Its time I part ways with low class retailers like Edgars, if this is how you going to treat your clients by sending their information to the Bureau just 1 month they are in arrears then you not some I should have a relationship with. You should take time to contact your clients before you act so stupidly. I will pay off what is due to you and never set foot in your stores, there's better clothing shops out there, I am done, you are useless to me now, you cannot jeapardise my name by such a small misunderstanding. I have been loyal for over 20 years and this is the thank you I get from you. If you still own an Edgars account trade very carefully and reconsider doing business with someone else, they are brutal.