Corporation Bank — regarding loan on fixed deposit

Address:

Jhalawar, Rajasthan, 326001

I Have FiXed deposit on corporation bank, Jhalawar, I have been visited to bank about OD on my fD in July he told me higher authorities not allowed for OD in this month after that again I visited in August month now September almost over 3 times manager refused for OD.I don't understand what is the problem with the manager any why always he refused.
My name is Ravi Shringi