Me and my co-founder has been facing this problem for a whole year now , I will not promote

My co-founder and I ran an ai automations agency for small businesses when we tried outbound sales overseas i was surprised to see how bad our English actually was 20 out of 100 calls we did we got faced with rejection only because of the Indian accent As I've started to learn and I have quite improved my vocabulary and accent ( it took me 10 months ) but eventually I hired a new guy for outbound he had an Indian accent too So less closes again I started to teach him myself but my efforts were needed elsewh