I work in a Call center. We have to make sudo (American)names so that our customer can communicate as though we are a citizen of their state. Further when customer ask where we are located, we say in the US. The sales promise we commit with our client we give 100% and they get what we committed. Does sudo and telling we live in US. Does Islam allow us to these practices or should I leave the job?

If saying you work in USA means that your intention in saying so is you are telling them you work for an American based company then fine otherwise it’s deemed a lie. As for using borrowed names it’s fine