The affidavit constitutes prima facie evidence of proper service, and gives rise to a presumption of proper service. A conclusory denial of service is insufficient to rebut the presumption. In order to warrant a hearing, the denial must be substantiated by specific, detailed facts that contradict the affidavit.
Bethpage Fed. Credit Union v. Grant, NY Slip Op 09246 (2d Dep't December 24, 2019)
Here is the decision.