Email sending stopped when I submitted my request for a dedicated IP address

I had a working email system. I wanted to improve this by requesting a dedicated IP address. When I submitted the request, the ability to send emails stopped and has been stopped ever since, not works. Nothing happens, I didn't get a dedicated IP address either, but need me to email sending should be continuous. How can I cancel this dedicated IP address request, I contacted customer service, but they didn't do anything, they just closed my request, since I also asked this question in the chat. The solution to the problem is urgent! I no longer need the dedicated IP address, as the email sending that was working until now also stopped. How can I restore the original state? The problem is very annoying!