Incorrect payment History

Im giving Splendi 2 stars mainly because, they do respond to queries when posted on hello peter but that shouldn't be the case in the first place. I logged a dispute to update my MR Price account which was never in arrears at all and even sent through the letter from MR Price stating my account is current and up to date and also provided statements. The month of August now shows in arrears for this account on my credit report which is incorrect, and i followed up with MR Price as well and they also confirmed account is up to date, i need Transunion to rectify this immediately as this has impacted my good credit rating due to inaccurate information reporting. I sent through 3 emails already with the letter from MR Price and my statements