See Chapter:2 Verse 256 also. The record of deeds maintained by Allah (SWT) is precise. The infidels are probably ignorant about this, therefore they get involved in other sins too, till those who are well – off among them are punished. This punishment will make them cry for help but Allah (SWT) will not help them and tell them that His message was read to them but they turned away in pride and got involved in useless things.