My first request was around June. My second request, followed by an addition support ticket was at the end of July. In both these situations, I’ve been left without any response - no "hi"s, no re-assurances, nothing.
Unfortunately, I am not from the EU region, neither do I live in one, but given how this also affects the citizens of countries under EU, how should I proceed further? Is there a webpage online, where I can just file them? Or is it only possible through the local DPA/court?
Yes. Email is also pretty thoroughly broken after years of spam and corruption by Microsoft and Gmail. It was never a reliable system and is even less so today. It’s a good idea to try again and use different systems if you have some.