I have been in business for nearly 30 years and have dealt with hundreds of vendors. 8X8 is the WORST. They fraud billed me constantly with very little recourse as you need to submit a ticket, but when you get down to brass tacks, the "customer service" agent deflects and cancels the chat. I'm filing a lawsuit and will post mre here. I feel there may be the basis for a class action here.
Recommendation: Avoid at all cost