Having and issue with GM Financial and a negative report on both my husband and my credit. From the onset of this contract there was a dispute/misunderstanding as when the 1st payment would be due. After several conversations between my husband and GM Financial and after a due date change request, we were under the impression our 1st payment was pushed to end of loan, due date changed to XX/XX/XXXX of month & 1st payment now due XX/XX/XXXX. I made ( 2 ) payments inXX/XX/XXXX - XX/XX/XXXX & XX/XX/XXXX then another on XX/XX/XXXX ; all before due date of XX/XX/XXXX - at least so I thought. The XX/XX/XXXX payment was to cover XX/XX/XXXX, the XX/XX/XXXX payment to cover XX/XX/XXXX and the XX/XX/XXXX payment to cover XX/XX/XXXX ; monthly thereafter I paid on the XX/XX/XXXX of month to date. I recently called to speak to a Rep about the late and past due payments showing and was advised that my XX/XX/XXXX was not received so every payment I have been paying monthly since the XX/XX/XXXX payment has been applied to the prior month. Then to my surprise, I get notification that a late mark has been added to both my husband and my credit report for XX/XX/XXXX & XX/XX/XXXX. After calling to inquire about that, I am told that my payment was posted on the XX/XX/XXXX despite me accessing GM 's website and actually making the payment on the XX/XX/XXXX ( keep in mind I am thinking I am up to date ; but GM Financial is applying my payments to a prior month ), so I dispute citing why would you report me for a day late only to be told the same thing again. Even though NOW realizing the situation with the XX/XX/XXXX payment, I advised GM I disagree with the late because I made the payment on time ( XX/XX/XXXX ) ; their 3rd party vendor posted to them the next business day ( XX/XX/XXXX ). I disagree with the fact that there are ( 2 ) customer experiences with GM depending on how you pay. If I pay by mail with check and it is received on the XX/XX/XXXX, it is posted day received. However, using GM 's website, if I pay on the XX/XX/XXXX it is not acknowledged till the 3rd party vendor XXXX XXXX posts it ; in my case the next business day ( XX/XX/XXXX ). I spoke to GM 's credit reporting department and they refused to remove the derogatory report citing I made the payment at XXXX and cutoff for 3rd party vendor to post is XXXX. I am disputing the derogatory remark, as it is not valid. I have been consistently making my payment on the XX/XX/XXXX of the month to GM 's website and that is the date I paid with the late in question. I feel that GM should honor the date their customer makes the payment on their site not the date a 3rd party vendor processes, which in this case resulted in a negative effect on their customer ( me ) who pays timely every month. GM did not call to offer me any remedy for the XX/XX/XXXX payment they say I missed & there was no letter sent offering me an extension ( which I qualified for ) to remedy the issue either, they just continued to accept the monthly payment and apply it to a prior month. I must give credit and say that the customer service department Supervisor did acknowledge the issue with the account and removed the late charges, but GM Financials credit reporting department refuses to remove the derogatory remark ; citing the date XXXX XXXX posts is the date they have to use not the date I accessed GM 's website to make the payment. When consumers work HARD to maintain their credit, big companies should not be allowed to destroy it due to their agreements with 3rd parties. Hoping that GM Financial will do what is right and remove the derogatory remark from our credit, which has had a detrimental affect causing us to lose a pre-approval for mortgage and will ultimately cost us down the line and in securing the best interest rates in other areas.