Mr. Thukral, Mr Chandrasekhar have given valuable advice. Kindly follow it.
You may not resign. You must not abscond. The HR personnel are misguiding you to fall in legal traps.
Rather you may build written record in your favor. You may forward all emails, files that may be useful.
You must document each and everything. In your appointment letter the job profile, KRA's of Manager-Operations must have been described. You may obtain copy of Certified Standing orders ( to be displayed at entrance) which may be kept at HR page of the employee portal, and also employee rule book of the company pertaining to your designation. These are to be circulated to the employee. If these are not made accessible you may write to your appointing authority, with a copy to Head-HR., to supply these to you say within next 7 days in office, and mention that you shall issue acknowledgment of these, on receipt which may be filed in your personnel file.
If sales targets have been assigned to you, you may take out the soft and hard copies of the emails, files, and retain all SMS also, stinkers, PPT's, presentations etc. pertaining to tgt. vs. performance.
While you write to the bank that you should be assigned duties commensurate with the job of Operation Manager, you may narrate each episode of thrashing, rude conduct, stinkers, meeting, which have happened on assignment of target, intimidation, coercion, pressure, exercised on you and conclude that you applied for operations portfolio, and not for sales and you were not recruited for sales however you are being coerced to sell to all your near and dear ones, walk in clients, and rope in your entire social circle.
You may record (audio/visual) all episodes of tortuous conduct of superiors. These may come handy and useful at appropriate time in appropriate forum.
If you have been coerced or forced to indulge in misselling, you may mention it.
It is to be ascertained what kind of training is mentioned in bond? Is it related to products and processes of the bank? If it bank is duty bound to provide it free. Who else shall train the employee on product, processes, marketing, sales strategies, rules etc of the bank? Is this training worth Rs.5 Lac/person? Has the bank or any institute hired by bank issued any training completion certificate?
Moreover the bond for the so called training was introduced after you were inducted in employment leaving no other option but to sign it. Did the bank mention in its advertisement, offer letter, appointment letter, that candidate shall have to undergo training and sign bond? You can allege coercion.
If you have already sent resignation you may submit a carefully structured communication, under acknowledgment, to suit you. It shall be appropriate to approach a competent and experienced service lawyer with all records and let the lawyer draft your representations. Your carefully structured representation shall help you to establish that employer had become unworthy of being employed with and bond was being used as a dagger to subdue the employee to submit to excesses at workplace which were of unbearable nature.