Either your employer is sending the payments to the carrier or they are sending it to BenefitHub to pay the carrier. Payments are sent to the carriers once a month. Depending on whether the employer is paying the carrier or if BenefitHub is, it could take up to 60 days for the carrier to receive the payment.
If you received a letter from the carrier, contact BenefitHub Customer care at 1-866-664-4621 or email customercare@benefithub.com and they will have this researched with the billing team.