Guys this is how I was able to do it. They not only made over 25,000 groups, but over 3,000 forums. I just signed into Google search console, found out my site was de-indexed due to spam.
I cleared it in the Tools/Forums/Reset all forums < this got rid of the over 3,000 forums
I then went ahead and dumped all data out of the Cpanel.
This however, didn't solve the cache issue. I tried connecting to SSH last night to A2, I don't have many complaints about them. or their service. I however, was not able to connect via PuTTy , despite using Yoast all sitemaps from the spam were still there. So I had to have a Technician at the host do it due to it being a VPS.
just incase anyone in future wants to do it.
OHHH, and I resubmitted my Sitemap to Google search console, going to take weeks it claims to see if issues were fixed. I then signed up to Bing (because they absorbed yahoos XMLsite map indexing) and submitted Sitemap there, then signed up for Yandex and submitted and had it verified from there.
I was wondering why the hell for months in fact, half a year my site's been up and not getting ranked. I did a google search nothing but Viagra and Mumbai call girls spam on the site.