Vodacom not updating information with all credit bureaus to reflect correct payment history

A few weeks ago, I lodged a complaint with Vodacom since my account was reported in 30-day arrears with credit bureaus. This issue was not resolved. I consulted with my lawyers, they agreed that my account should not have been reported in arrears. They advised me to report the issue with the credit bureaus before they take legal action against Vodacom. I lodged the complaint with Transunion. They escalated this to Vodacom. I got feedback from Transunion that Vodacom has responded and agreed that there was no 30-day late payment since I paid all the amount due as per the statements. My Transunion credit profile was updated and there is no late payment reflected there. But Vodacom has not updated this information with all credit bureaus. Experian still reflects the 30-day late payment. I really don't want to waste my time lodging the same complaint with each of the credit bureaus anymore. Vodacom please update this information of no late payment with all credit bureaus. Otherwise I am going to take legal action.