What is happening?

I've been apart of the prolific community for almost a decade. A few months back I was invited to participate in a study that involved downloading an app and answering 4 mental health questionnaires a day for the span of a few weeks (can't remember how long exactly). When the study was fully completed the researcher reached out letting me know I had completed it and letting me know how much I had earned for said study and claimed I would be paid out within a few days. This was back in November and I still have yet to receive payment. I have reached out to the researcher multiple times with no response at all as well as prolific support with again, no response. I can't even find the study name or researcher name anywhere in previous submissions. I have a full chat log from during the time though. Was I scammed by a researcher into giving personal mental health info? Why isn't support getting back to me and helping me figure out what's going on?