Is it obligatory to dispose of only the interest, or of the entire amount deducted from the salary while working at an interest-based bank, and what about the money that was spent during that period?

If a person was unaware of the prohibition of working in an interest-based bank or participating in an interest-based investment fund, and then repented after learning of the prohibition, they may benefit from what they earned, based on the verse: "So whoever receives an admonition from his Lord and stops, he may have what has passed, and his affair is committed to Allah." (2:275) Some scholars do not restrict this to ignorance of the prohibition but hold that if one repents, they may keep what has passed.