Attempting to Subscribe my Irish LTD to the Customs Declaration Service.

I have made several unsuccessful attempts to Subscribe my Irish LTD company to the Customs Declaration Service. I have received emails from the CDS mismatch team asking me to try again, but I still have not been able to gain access. I have checked my GB EORI details and ensured the company details match the original registration details. What is the best email to contact to have this type of issue resolved please?

Hi,
We  would advise contacting the Customs and International trade helpline on 0300 322 9434 for help in relation to CDS registeration.
Thank you.