Woolworths dishonest about payments

I pay every month the fixed amount as arranged with Woolworths but still it reflect on my credit report I received that I am missing payments. It is Woolworths responsibility for updating my credit profile each month – at this stage I would like to have clarity and feedback because it isn’t updated and reflect negatively!!!!I have a arrangement with them paying the outstanding amount and still they do not come back to you about this issue.