Business ProfileforOnPoint Community Credit Union

I have been a joint owner of my mother's OnPoint account for over 15 years to watch her account since I also bank with OnPoint. My sister received *** over mom's account to helkp sell her house last August since mom does not do online transactions. In November, 2023, I noticed ****** wired out of mom's account. When I asked her about it, she told me it was to be for $11,000 and went to my brother in ****. At this time, I informed her it was $10,000 more than she thought. With her permission, I moved her money to my bank account until we could figure this out. My sister, ****, has a friend who manages the Sherwood, OR OnPoint branch. At the time I transffered the money, the branch manager alerted my sister. She called my mom, whom called and asked me to put it back which I did. I then drove to her home to show her online the transaction was for $******, not $11,000. After logging into my account, I realized I was no longer a joint owner. The ***************************** manager had removed me without my written consent. This is against bank policy and the law. This really upset my mom since she had no idea, and I have been on her account 15 years and never took a *****. Without my sister's approval, the bank refused to add me back on the account. My mother then has the *** revoked and rewritten for only health care decisions, nothing financial. Mom and I then took the new *** into the ************** branch only to learn we had to close her accounts and reopen them with different account numbers. When my sister found this out, she went into the bank again talking about her ***, not knowing it had been revoked. At this time, the bank froze mom's accounts until a conservatorship is setup. About 3 months prior I added my mom to my savings account incase something happened to me, she can help by accessing my money. Without a phone call, text, or email to myself, OnPoint froze my savings account because mom's name has recently been added to it. Please help.