Business ProfileforStandard Mortgage Corporation

I have my mortgage on my home (mobile home) with Standard Mortgage. I have my mortgage payments set up on automatic pay with my bank ************** and have always had it set on auto pay. In March a woman with Standard Mortgage called my mother and said the payment had increased before the end of the year and an additional payment of $308 dollars needed to be made to bring the account to current standing. My mother authorized the payment and it was taken from my account and she logged on immediately and changed the payment amount for deduction to the current increased amount of my mortgage payment. Soon after this I started being contacted each month by a phone call saying that my payment was past due. I kept telling them that it was on auto pay and all payments had been made and taken out of my account. The guy I spoke with, *****************************, (He was the one that always called me and sent emails) was very rude when I would tell him that my payments were on auto and I was not behind. I have all my emails sent to my mother's email address because I don't do much on the computer. She sent emails back to ***************************** explaining that all payments had been made and taken from my account. They continued to call and harass me each month. Finally, a representative named, *****************************, called and spoke with me and my mom one day. She had printed off all of my bank statements for the past year and highlighted each payment that had been made through auto pay and all had been made. She went through month by month, payment by payment with ****** (and he was very kind and courteous). They found that one payment was made the first of December 2022 and the January 2023 payment was deducted the end of December 2022 so all payments HAD been made. He put us on hold and went to speak with his manager (****). When he returned he said that the manager said one of the payments (apparently that payment at the end of December, since there were two made that month, had been posted wrong and was taken off the end of the interest, so I still needed to make an additional payment for me to be caught up. I am sorry, but that is not my responsibility because they supposedly posted incorrectly. The last time they called, they said it was affecting my credit and now I am two payments behind. How? And if the additional payment of $308 in March caught my account up, then how did the problem start with a check being posted incorrectly the end of December? It appears to possibly be a scam/fraud, I do not think this is appropriate business technique. I want them to fix the problem on their end and then fix the damage they have made to my credit report.