Yes, all Monek's systems used for the processing & storage of card information are audited and validated by Qualified Security Assessors to the highest possible standard available under the PCI:DSS scheme. Our PCI certificate can be found here.
We are responsible for all card data stored on our systems.
As the merchant, you will still be required to complete an online PCI DSS assessment questionnaire, as per the instructions from your Acquiring bank or their appointed Assessor. Please contact them for details on how to proceed.