Working for a bank

Q: I hope you're in the best of Imaan and health by the grace of Allah Ta'ala. I'm a graduate with finance and economics Alhamdulillah. However, I find myself getting into a job at a conventional bank. I'm in a training program with 1 of the big 4 banks in SA to be placed as a teller or consultant. I know the severity of being involved with interest in all angles of such a transaction, so my heart pains & I feel very unhappy about the road I'm on at the moment. Allah Ta'ala has made me very conscious of Him in my actions. I thus want out of this position & if I were in a position to wait for a permissible job, I would do that right now. My family is not in that position. My dad doesn't have employment & my mum is not well now. I'd really appreciate your invaluable advice on a way forward. May you also please tell me what I can recite for my mum's recovery from cancer?

Offsetting interest from one bank with interest received from another bank

Q: I have an account with absa and one with Standardbank. I receive interest from one account because of excess funds and from time to time I am charged interest from the the other bank. For example, this past few months, I received interest of R500 from Absa but I was charged to pay interest to Standard bank to an amount of R600. My question is: Can I offset it from the interest that I was given by another bank?