Paymentico:
Billing support: https://help.paymentico.com/
Email: help@paymentico.com
Phone: 1-855-877-7020 (USA/Canada Toll Free)
Phone: +441344586020 (UK/International)
Epoch:
Billing support: https://www.epoch.com/billing_support
Email: billing@epoch.com
Phone Toll Free: +1 800 893 8871
Phone Worldwide: +1 310 664 5810
SegPay:
Billing support: http://cs.segpay.com/
Email: help@segpay.com
Phones: +1-954-414-1610 and 1-888-376-0948