Where to ask for a replacement

I've been using my Venu 3S for a month now and has been happy with it overall. By now, though, I have encountered a number of issues that makes me think the product may be faulty:

  1. Audio issues with ALL in-built breathwork activities (reported here in this forum)
  2. Issues with ECG app - after the first measurement, new results are not uploading to Garmin connect  After a long time (a day or so) they got uploaded eventually. Must have been a temporary sync issue with Connect.
  3. Step count way off all of a sudden: I was sick yesterday and literally did nothing all day except for walking the dog 3x (~4.5 km total), yet the device logged 20k steps for the day, most of them during the hour that I spent in a meeting, sitting at my desk. Today, in addition to 2.5k steps during a walk, the device is logging and extra 2k steps out of nowhere, when in fact I spent most of the morning working from home and doing a tracked workout. 

[Never mind, two of those issues got resolved, #1 is hopefully getting addressed in an upcoming patch. Keeping the device :) ]