Joy Business has learnt that MTN’s Corporate Services Executive, Mawuena Trebarh, has resigned from the company.She is said to have packed out of her office yesterday after tendering in her resignation letter and bidding some colleagues goodbye.Mrs. Trebarh has been with MTN since January 2007.Her exit comes on the back of a few other major resignations from the mobile operator.Notable amongst the most recent exits is the movement of the former Chief Marketing Officer, George Andah to rivals Bharti Airtel last year and the exit of Chief Technical Officer, Eben Albertyn.