I mentioned the CEDR (Centre for Effective Dispute Resolution) elsewhere on this thread. I believe they are UK based and the company in question needs to be covered, but a quick glance shows Sky, Vodafone, Virgin etc. listed.
Disclaimer: I have no experience with/knowledge of them aside from my one experience.
Disclaimer: I have no experience with/knowledge of them aside from my one experience.
https://www.cedr.com/consumer/cisas/