Well it's been little over a month and 1900 km and I've had to take my Polo to VW to have its interior checked.
The VW garage mechanic told me that VW had already released some Technical Bulletins about those issues and I got my car fixed in a few hours.
Still, it bugs me that an expensive car (for the size anyway) made in what is claimed to be VAG's most up-to-date factory should have that sort of problem after a year in production (in Brazil, even longer in Spain and Slovakia).
Are there other Polo owners out there experiencing similar problems? Any feedback is welcome!