I used Cigna for my wife and myself until about 4 years ago, and I stopped the insurance cover because they kept increasing the monthly premiums (I don't remember how much it was, but it was sufficient to cause me to discontinue the policy). We had never made a claim, so I didn't see the justification. My son was previously insured with Cigna, and he had so much trouble getting them to accept a claim that he eventually gave up. That's the worst fear about an insurance company, they just take the money and when you need them, they're not there anymore.
We're using OSDE here, and while the costs are climbing each month (in Pesos at least), they do actually provide cover. Also apparently in bordering countries, though we haven't tried that. And we use some travel insurance like AssistCard or WorldNomads when we're going to be outside Argentina. I wouldn't recommend Cigna.