Transunion terrible service

I settled a OMF loan on 24 January 2019 and on 27 Jan 2019 all the credit bureau's except Transunion updated my profile. Thereafter i logged a query (TU ***) on 28 March 2019. Unfortunately after numerous phone calls and emails Transunion neglected to update my profile. OMF in turn re-send the relevant letter for credit profile change for a second time but alas no joy. I managed to get a attorney to attend to this and believe me Transunion opened a NEW query. I intend to open a case against Transunion because i was declined for a homeloan application due to this adverse information on my profile. If this behaviour is acceptable practice then i would lobby that Transunion credit bureau be barred as a whole because up to date still no change.