You seem to be blaming the victim of this, instead of the perpetrator(s). The OP does NOT have to go to court (or similar), it is up to them. That does NOT remove the obligations of the seller and (maybe) Vision Engineering, from putting the situation right.
Well yes, but in most jurisdictions, including apparently Brazil, if you purchase something the contract is between you and the seller. If the goods are not as described or are otherwise defective, the burden is on the seller to put the situation right. If you give the seller a reasonable opportunity to do so and they fail, then it is appropriate to invoke relevant consumer protection laws.
What is puzzling in this case is that the OP has apparently waited 6 months without resolution from the seller, and has in all this time not made use of any legal remedies available, nor is even willing to name the seller involved.
Something seems very strange here.
By law, only the victim (the OP) may bring a lawsuit.
An action brought by Vision Engineering against the seller is legally inadmissible.
Vision Engineering can not substitute for the victim or make a complaint to the Brazilian procon.
The perpetrator is obviously the seller, not Vision Engineering
Who is this seller?
I tend to agree with you both. There seems to be three ways this could be sorted out:
(1)...The OP takes the seller to court or similar organisation in Brazil
(2)...Vision Engineering, put huge pressure on the seller, by threatening to drop them, if they don't sort this out.
(3)...Vision Engineering, make a good will gesture and sort this out. Legally they probably DON'T need to, but it would lead to better customer satisfaction. Since the seller was/is authorized to be one, by Vision Engineering
Maybe you are both right, and the courts is the way to go.
Vision Engineering, are still potentially bad, because they should only authorize decent/honest/reliable sellers/resellers. Otherwise it can damage their good name.