Business ProfileforNicolet National Bank

My mother and I have a shared banking account to use for expenses for her home that suffered a fire in March 2023. I bank wired initial deposit payment to begin work for her home (located in **********, **.) and those funds went to ***** ********** that the contractor identified on/around April 29th, 2023. On May 11th, 2023, we received an email requesting an additional $6000.00 for materials needed, but the funds were to be wired to Nicolet National Bank with a POC by the name of ******************************. It was stated via email correspondence that the contractor's financial institution account has been experiencing issues was the reason for the change. We made the wire transfer as requested. On May 17th, 2023, another email was sent from contractor requesting additional $3500.00. At this point, my husband (*******************************) reached out to the contractor via cellphone and learned that he NEVER requested the additional $3500.00, nor the $6000.00 that was requested on 5/11/23. With the assistance from my husband, we immediately submitted and initiated a wire transfer fraud with our bank USAA. They requested we submit any and all email correspondence to help with the investigation which would take anywhere from **** days. The final documents we provided were completed on 5/18/2023. On 5/31/2023, we received a final report from our bank USAA stating on May 17th 2023, they submitted a recall request with ****** National Bank (listing the **** ******************************) and we received only $588.00. It seems to me that if the receiving bank did not acknowledge any wrongdoing, then why the less than satisfactory amount of $588.00 was refunded and not our entire $6000.00? It seems that Nicolet National Bank is withholding our remaining $5412.00 and this POC (******************************) is part of the email and wire fraud scam.**We have email screenshots of these requests.Please help as I feel someone is getting away with this wire scam.