Group booking unprofessional and unfair service

After many back and fourth emails always having to wait for a reply I finally confirmed via email a group booking offer. Once again having to wait for feedback I receive booking information but the times were changed due to no seats being available. THIS is unacceptable !!!!

I already shared info of group booking with group members. Surely a group booking and confirmation is a VALID Agreement.

Booking offer: ***7 SENIOR MANAGMENT please assist and advice.