Charges NGO's for a service and then doesn' delive

Traveled to JHb for a CSI conference and was given a list of things we would experience and people we would hear from , very little came through , talks off topic and a poor turn out , cost was high . people complained and made it known and then they send us a letter after hearing our grievances offering a 30% discount on the next summit . As if anyone is going to waste their money to attend after what we experienced . shocking and clear disregard for the basic business practices