Honesty in business dealings

Shalom and thank you for your question!
A great Rabbi was once traveling with a wagon driver, who stopped the wagon and asked the Rabbi, (not realizing that his client was a great and learned person,) to watch the wagon while he went into the field and stole some produce! The Rabbi agreed, only while the man was busy gathering the contraband, he started crying “You are being watched, you are being watched!” The wagon driver turned his head this way, and he turned it that way, but didn’t see anyone in sight at all. He resumed his gathering, when again he was interrupted by the Rabbi’s cry, “You are being watched!” Eventually, the Rabbi explained to the driver that indeed, no physical person other than himself had seen him, but G-d watches our every move…
You understand what I mean…
You did the correct thing. You received an item, and paid for it. It could be true that the compensation you received for the company’s mistake, and the resultant delay in receiving the item, was not adequate, but probably it is also not worth the time, energy, or expense, to sue or make an issue of it.
It seems that you can celebrate the fact that you used your capacity for free choice to choose wisely, to choose truth. You can be proud of that fact.
Now, what about your friends, the ones who believe in G-d so strongly, that they don’t want to throw His gifts back in his face. That is admirable. Ultimately, deep inside they are probably aware that what you did was the correct thing to do, and thus you have earned yourself more points in the Heavenly scheme of things. Meaning, you accomplished a sanctification of G-d’s name. In the Ten Commandments, the ‘headlines’ of Jewish practice, it says not to take G-d’s name in vain. That’s why we don’t write all the letters of His name when we are just ‘talking’. There’s a positive aspect to this. Just as we are not to take his name in vain, we are to seek opportunities to sanctify his name. That’s why the great Rabbi Akiva, while being tortured to death, was actually happy, and explained to his students, as the life was seeping out of him, that he had always yearned to give up his life for the sanctification of G-d’s name.
The Lubavitcher Rebbe teaches us that this type of sanctification is not the challenge of the current generation, but rather, living according to the code of Jewish law, despite the challenges we have in THIS day and age, is the way we can and should sanctify G-d’s name. Even when Amazon doesn’t come through for us, and especially when they don’t, we need to do the right thing.
And that’s what you did…
In one of the Rebbe’s letters, he wrote to someone that “I’m glad you realize that you are on active duty….” and he also told the person that he was writing to, that he should “march forth with a song of victory!”
The famous codifier of Jewish law, Maimonides, goes into great detail about what constitutes sanctification of G-d’s name, and what constitutes desecration of it.
There are three categories for which we must be willing to give up our lives, rather than transgress. These are idolatry, adultery or other sexual offenses, and taking someone’s life. (Unless that person came to kill you.)
There are many laws and details concerning this, which we won’t go into right now, but it is interesting that Maimonides (known also by his acronym Rambam,) also teaches us that if a person behaves in a negative way, with unrefined character traits etc, that also constitutes desecration of G-d’s name. On the other hand, when people see a Jew who lives by his Jewish values, is caring, personable and honest, this is indeed a very great sanctification of G-d’s holy name!