Hello @Adrian
Welcome to Microsoft Q&A Platform,
According to the registrar info the domain is with Ascio, they should be able to help:
https://who.is/whois/combiwearparts.com
Name Ascio Technologies, Inc
Whois Server whois.ascio.com
Referral URL http://www.ascio.com
Status OK https://icann.org/epp#ok
Did they explain why you have to engage someone else?
Best regards
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