batch changed by climb first

Location/place: mumbai

Name of company/service: climb first

I had enrolled for the gre course at climb first.The lecturers there at climb first are highly experienced and teach well.Also the climb first conducts our lectures regularly and all the problems faced by us our solved.
Last day i couldn’t attend the lecture and i didn’t inform the climb first authorities as i forgot to do so. The next day i got a call from climb first that i attend the other batch as i had missed some part..but i am uncomfortable with it and i had informed them but they are not listening to me saying that they need to complete the portion on time.