Same here regarding the support. I helped a company migrate to Sendgrid, and right after paying and integrating, we were locked out of the customer panel.
We created a ticket, and a few hours later we were also locked out of the support area. All in all, it took them 7 days from locking us out before we received a human response and they fixed it.
We recently couldn't deliver to Hotmail. It took them 27 days before the first response (P2 Degraded). They didn't fix it, and wanted us to switch plans.
We currently still have a subscription, but the project we're using it for became on hold during the Hotmail problem. The project will be cancelled soon, and we'll cancel our Sendgrid subscription.
If the project wouldn't have been cancelled, we would've probably switched to another email service.
We created a ticket, and a few hours later we were also locked out of the support area. All in all, it took them 7 days from locking us out before we received a human response and they fixed it.
We recently couldn't deliver to Hotmail. It took them 27 days before the first response (P2 Degraded). They didn't fix it, and wanted us to switch plans.