Your DNSSEC zone had bad NSEC3 records that proved the nonexistence of the pay.epicwebstudios.com subdomain, as shown in the Errors
section of http://dnsviz.net/d/pay.epicwebstudios.com/W7WS8g/dnssec/
You have since fixed that (http://dnsviz.net/d/pay.epicwebstudios.com/W7YYfw/dnssec/), so presumably all is working now.
In the future, try using the dns.google.com query tool as it can provide some limited diagnostic comments on reasons for resolution failure.
Also, be sure to check against other DNSSEC-validating public resolvers like 188.8.131.52 and 184.108.40.206.