Service bond in bank

My sister joined andhra bank in june 2018 as scale 1 officer...on joining they were made to sign a bond of rs 2 lakh....a few months after she got a letter for appointment in dsssb as a clerk with delhi as place of posting...but now she wants to join it....since the working conditions in the bank are not so good...bank staff is short hr deptt is not ready to give new staff...she leaves home at 9 in the morning and comes mostly at 8 pm sometimes even 9 pm ....this is taking a toll on her health since working hours are not fixed...this is harassment....but when she wants to leave they r asking her to pay bond amt plus gst@18%....three months salary plus gst@18% since she is not serving notice period...she has undergone training for 14 days at hyderabad training centre...also they r not ready to transfer service bond as per the dpe circular their legal deptt says andhra bank is not a psu hence the service bond is not transferrable ....the bond amt is really huge...please help and suggest some way out...if i do not pay will they not relieve my sister???