English Training Teacher

As you know, I'm taking a business English training twice a week in the office. English teacher is only native English speaker. They are dispatched by English education company. Basically, one English teacher is in charge of our English training until Aug. However, I have already attended a English training by 3 different teachers. My frist techer who come from New Zealand, leave from this education company only 2 days. I was very surprised when I heard it. Today, new teacher who come from USA was coming my office for our English training. I hope he do not leave from company.