Incorrect information dispute

Disputed an incorrect information on my credit report, financial provider furnished transaction history and account statement confirming the incorrect information, Experian investigation department investigated my case and the incorrect information was removed.however, I am in a more worser position than before…credit score drastically declined from 659 to a minus 5 and that vehicle account is completely removed from my report. Lisa nconjana and James consultants from Experian advised my query has been resolved in my favour and I should check my report after 48 hours, it’s been 4 days now my score is still a minus 5 with no valid explanation why. Since December 2022 this query has been in process and Experian advised on 20 business working days to resolve this. Their customer service number is being answered by a machine and hanged up after that with no options to speak to a consultant. Had I known fixing an incorrect information would further dent my report, I would have just left it. Maintaining a healthy a credit score with such a service has been nothing but a disappointment.