I only pay them for domains, and they have my CC for Cloudflare Workers (but I've never paid them).
I ran into a few issues with their platform, once with R2 when it first rolled out, and a couple of times with domains, and once with caching not clearing.
I think I submitted my request through some form (this is a while ago, hazy) and someone always got back to me within 4 hours. I think they're supposed to get back at least 24-48 hours.
Mileage may vary, and this was a while ago, so maybe things have changed now.