Mutual of America complaint: Monthly Retirement Benefits

Since September 20, 2022, I have been in contact with Mutual of America regarding my monthly retirement Benefits. Due to my checking account being hacked, my checking account was closed which meant I could not receive my monthly checks. I have sent the necessary paperwork (Electronic Funds Transfer Agreement form along with the Non-Federal Direct Deposit Enrollment form from my bank. I was missing 4 payments. I finally did receive 2 payments by mail. As of January 1st, 2023, I am not receiving my monthly retirement benefit checks. But I am still owed 2 payments from November and December. As I mentioned I have sent my letter via fax every 3 weeks since September 20, 2022. I have not received any communication from Mutual of America either by letter, phone call. I’ve tried calling the 800-468-3785 but have not been able to get anyone to return my calls. On January 27, 2023, I called a number (Current Plan Sponsor – 888-905-1210) and the lady told me she couldn’t help me, but would transfer me to the correct department. I waited on hold for 45 minutes, no one answered my call. I don’t know how to go about getting the last two monthly retirement checks that is due me. Can someone help me as to how I can get these two payments made to me?