Problem with a company's investigation into an existing problem: Credit card

I am filing this complaint because I believe this account is being reported inaccurately on my credit reports. I disputed the account with the credit bureaus after noticing that important information does not match. For example, the Date of Last Payment is different depending on which credit bureau I look at. The Date Last Active is also reported differently. The account also shows a $1500.00 credit limit even though the account is closed. After I filed my disputes, I was told that the account had been verified as accurate. However, the same issues remain and nothing was corrected. I have also asked for documents supporting the information being reported, including the original agreement, account statements, payment history, and records showing how the account was verified. I have not received the documents needed to explain the discrepancies or support the information being reported. I do not understand how the account can be verified as accurate when different credit bureaus are reporting different dates for the same account. I am concerned that the information being reported is not accurate and that my disputes were not properly reviewed.