Unfortunately, there is (usually) no site in the network for your question, for the simple reason that it can only be answered if you work for that company. While the Stack Exchange community has some very knowledgeable people, they don't have a crystal ball and can't look in a company's internal systems, policies or strategies. Also, the mostly asynchronous Question and Answer format doesn't lend it self to replace customer service.
None of the Stack Exchange sites cater for personal needs that are only of interest to the asker. Chances are your situation is unique and temporary; due to the locality of the problem in these service related questions, they won't add lasting value to the knowledge base Stack Exchange sites aim to be. It is no use to have content around about how your specific case was handled in 2016 with Acme Inc. Even things like providing ways to access the service channel of companies is time-bound and will go stale soon. That will neither attract nor retain future visitors.
It looks like you have to solve this problem on your own, with help of the customer service of the company involved. If that doesn't work and the company doesn't help you even though you're entitled to it, depending on the problem, you might be able to invoke the help of consumer organizations or even legal services. In some cases turning to Twitter or other social networks manages to get your case attended to. The Stack Exchange Network is not in that social network category.
Some problems of this kind might be able to be solved without such internal knowledge. You might want to try entering the product or company name in the global Stack Exchange search and see what questions and communities come up. Check the article What topics can I ask about here? (in the Help Center of that community, of course) to make sure your question is on-topic there. But chances are you have more luck using your favorite search engine. Sometimes, questions may be good, but not a good fit for Stack Exchange.