Rattle- clicking noise in B- Pillar drivers side between doors

[Scotian7]

2019 GMC Canyon all terrain bought in July 2019 with 12000km on it has clicking noise in drivers side between doors around seat belt adjuster (B- pillar area). Had the truck to two separate dealerships 7 times altogether with no success after the dealer trying different things including:

 

1.Replaced rear side door arm rest cover trim 

2.Center pillar upper trim panel replaced 3.Replaced clips in door

4.Replaced power door lock actuator (which was very loose according to them) 5.Replaced all door weather striping.
 

Not something you would expect from a new truck. Any ideas what this could be? 

[Dingbatz]

It's a seatbelt tensioner support spring, had the same problem with my 16 Colorado.