If it was that long it may be a delayed pay out. If you grab a screenshot of the survey page with the URL that helps when putting in a ticket.
When I do surveys on the desktop the survey opens in a new tab and the page that I clicked to start the survey is still open. I leave that tab open until after the survey is completed and that will show me what the survey ID was in case something goes wrong. If doing it from your phone you can screenshot the survey list first before clicking on it to keep the number, just have to remember which one in the screenshot was the one you picked.
Most times if it's a delayed pay out it'll tell you on one of the first screens, but sometimes they wait until the survey partner accepts your survey which can be days (or weeks) after you finished it. You'll see some posts of folks getting random surveys pop up that they don't remember taking, including me

I think I have one out in limbo now and I don't remember if it was 75 or 100. But it didn't tell me up front it'd be delayed, otherwise I wouldn't have waited for that little, it said something towards the end about verifying answers before payout. I got the completed successfully banner but no sb, so just waiting to be surprised now. Hope it shows up randomly for you.