Telephone support is only an option on Enterprise plans. That shouldn’t prove an obstacle to getting your situation remedied, however.
The symptoms you describe sound like your previous provider used Cloudflare for SaaS and failed to remove your domain from their account. The best option to get the quickest results is to contact that provider and have them remove your domain from their Cloudflare for SaaS. Once they do, your site should work as expected.
In the interim, you can get your site online by setting the affected hostnames to DNS only. Let us know how things turn out or if we can be of further assistance.