Why has an error blocked me from sending emails all month?

I'm extremely disappointed with the customer service and the platform right now. All month there's been some error that doesn't allow me to send emails (you know-the main function of this service), and when I reached out to their chat line they said it was a known issue they are "working on" and would update me. But I haven't been updated, and I'm unable to use the software I am paying for... there's no telling when it's coming back. I tried to reach out again today but the chat line and customer support number are listed as closed (it's 11am on a Friday), so this was my only option. I would like a refund for this month and if the service is still down in June, I'll be cancelling my subscription. I need to be able to use emails for my business and my clients, this is unacceptable and a waste of my money.