ANSWER:
You must look for another job ASAP as the job and the salary of a conventional bank that deals in riba is haram.
There’s no obedience to the created at the cost of disobedience to the Creator. You are a big man and must make your own decisions. Resign and continue to look hard for jobs and in Sha Allah before your one month notice is over you will get a better job.
https://youtu.be/a8HzdbhBd9Y