BB&T Financial Bank Account Or Service Complaint

BB&T Financial Bank account or service department,

Checking account Deposits and withdrawals Florida

My business partner and I opened a DUAL SIGNATURE account, at BB & T, which required both signatures for any transactions. She and I, each, put $ - the account and were adamant with the Bank Officer that we had to sign jointly and we signed a card to be filed with BB & T. On - -, 2015 an investor, ( He was a friend of my partner. ) came on board and loaned us $25.00, - payable in 6 months with 5 % interest. All - ( - ) of us signed a Promissory Note at the bank with the same bank officer as a witness and notary. We wrote a check for a deposit for $ - a lease for a building on the beach. Monday, - -, 2015, the banker called me and informed me, my partner had withdrawn all the money andCLOSED the account, but they were depositing my initial $4000.00. back into an existing account I had already with BB & T. When I questioned the banker about how my partner was able to withdraw without - signatures, she informed me that as a partner she ( my Partner ) could manuever money as she saw fit since she was a signer on the account. I contacted BB & T corporate and they referred me to a clause stating that if was unclear, they could allow - signature to conduct transactions if they are unclear that - signatures were required. The same Bank Officer is the one who opened the account, witnessed the promissory note signatures, and closed the account. I do NOT see how any of this can be misunderstood nor unclear. Now I have a $12000.00 check floating around out there with my signature, ( and my Partners ), on a closed account. HELP!