1. If you are not yet relieved from the services of your bank, you can withdraw your resignation letter and can continue in the present employment. Merely because the bank has conveyed the acceptance of your resignation does not make you to compulsorily get relieved from the bank. If you decide to continue in the services of the bank, this bond period and notice period would not bother you.
2. Since you have already served Service Bond of three years and also 3 months' notice period calculating from the date of submission of resignation letter in May'14, the bank can not ask you to deposit money in lieu of the same. The same thing can be brought to the notice of the bank authorities.
3. In the resignation letter by the employee, if there were to be a particular relieving date and depending upon the exigencies of the work, to arrange for alternate or substitute employee, the bank may take time to accept the resignation and in this case it has taken 10 months.