Permissibility Criteria For Income
One’s income is halal by default. All prohibitions are in the realm of morality. If one makes any money by, for example, deceiving others, lying, stealing, cheating, usurping the rights of others, being unethical, or doing legally unlawful transactions then such money is haram. Similarly, shirk (polytheism) is also prohibited as well in such transactions because it is immoral in that we make unsubstantiated claims regarding God. Using non-real names in call center environments is generally not anything immoral because the names of employees have no material effect on the business transactions they undertake. Of course, if non-real names are used to deceive customers then that would be immoral. If you earn any money through haram means and then later realize your mistake, the key thing is to take appropriate actions to fix the error, humble yourself in front of God, and sincerely repent to God for your mistake.