You need to contact BCE and have them contact Sertigo, aka Comodo.
Also and because SHA-1 encryption is now deprecated, only the SHA-256 thumbprint is being used for verification purposes by the OCSP servers. validation processing are using the same AAA Services root cert. Referring back to what I posted previously, it appears OSCP servers used in web site cert. Note that Microsoft browsers use the Win root CA store exclusively for web site cert. This is why the web site web site is fully accessible via FireFox and not so in Microsoft browsers. contains both SHA-1 and SHA-256 thumbprints whereas the Win root CA store cert. is not the same as that one present in the Win root CA store. It's listed under the name of 'Comodo AAA Services root.' It also matches that for the same cert.
