According to a letter seen by a major Newswire, Amazon has requested India's antitrust authority to rescind its permission for Future Retail's $3.4 billion sale of retail assets to Reliance, claiming that it was "illegally obtained," violating an order halting the deal.

According to a letter written by Amazon to the Competition Commission of India (CCI) last week, the clearance for the purchase was a "nullity in the eyes of law" because an arbitrator's order was still in effect.

The fight for supremacy in India's growing, nearly trillion-dollar retail business pits two of the world's wealthiest men, Amazon founder Jeff Bezos and Reliance Industries Ltd CEO Mukesh Ambani.India court orders antitrust body to rule on Amazon-Future dispute within two weeks | ZAWYA MENA Edition

The victor of the battle for India's second-largest retailer and Amazon's estranged local partner, Future Retail, would take the lead in the race to address the daily requirements of over a billion people.

Requests for a response from the CCI, Amazon, Future Group, and Reliance were not returned.

Future claims the arbitrator's suspension order is unconstitutional, but Indian courts have refused to overturn it.

It would be a big blow for oil-to-telecom company Reliance if the regulator agrees with the previously disclosed letter.

Last year, a Singapore court issued an injunction against the purchase, arguing that Future had broken contracts prohibiting it from selling the assets to companies like Reliance.

However, the CCI later approved the purchase.

In a letter dated Wednesday, Amazon claimed that Future misled the CCI and continued to seek clearance for the deal, calling the injunction a "brazen attempt to violate the rule of law."

Amazon requested a personal hearing with the CCI in order to present its case.

The letter comes as Amazon fights charges that it lied about facts and withheld information in order to get antitrust approval for a 2019 acquisition with Future Group.

Amazon has so far been successful in using the terms of this agreement to stymie Future's deal with Reliance.