Do not posts links to porn spam. Use some common sense. Now you're a spammer.
I had to censor and merge most of your "proof". That leads into the actual topic...
was used to purchase some domains. None of the site data is hosted by Namecheap, and all traffic is being forwarded elsewhere. Email NS is also forwarded, but I doubt it's used, as "eforward" is the default record. At most, Namecheap can suspend the registrations -- and they surely will after the abuse@ complain is properly
filed. I'd wager you didn't properly file anything, but instead sent them accusatory rant emails.
The actual spam is SMS, not email. Well, Namecheap doesn't have SMS service. What service is sending the SMS? No idea. But it's not Namecheap.
The email addresses being (ab)used are Hotmail and Gmail. Gripe at them, not Namecheap.
The destination sites, where the forwards stop, is using Amazon
EC2. Again, not Namecheap.
accuwebhosting.com is a competitor web hosting company, and their "resources" are nonsense. Since the "resources/who-is-hosting-this-website" page gives an error of "Connection failed: Connection refused", I'm going to safely assume this is a failed spam attempt on your part, and merely a smear campaign against Namecheap. Nice try.