In my opinion you were still under probation and not confirmed officer/employee of the bank, hence verify if this rule what you have quoted would be applicable to probationers also.
"Officer" means a person fitted into or promoted to or
appointed to any of the grades specified in Regulation 4 and
any other person, who immediately prior to the appointed
date, was an officer of the Bank, and shall also include any
specialist or technical person as fitted or promoted or
appointed and any other employee to whom any of these
regulations has been made applicable under Regulation 2;
These regulations shall apply to all officers of the Bank and
to such other employees of the Bank to whom they may be
made applicable by the Competent Authority to the extent
and subject to such conditions as such authority may decide.
They shall also apply to officers transferred/ posted/
deputed outside India except to such extent as may be
specifically or generally prescribed by the Competent
Authority.
The section 16 of the regulation referred herein states under sub clause (3) states that Where during the period of probation, including the period of extension, if any, the Competent Authority is of the opinion that the officer is not fit for confirmation: -
(a) in the case of a direct appointee, his services may be
terminated by one month's notice or payment of one month's
emoluments in lieu thereof.
You can make representations to the competent authority in this regard venting out your grievances and after exhausting the remedies you may try for the legal recourse, if necessary.