Tech giant Google on Thursday formally rejected antitrust charges filed by the European Union against the company.

The EU is accusing Google of unfair promotion of the company's shopping service and blocking off rival services in its online search advertising business. Google could face hefty fines if the European Union finds the company guilty of the charges.

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Google's response to the European Union's accusation was released six years after the commission first opened the investigation. Google's rival, Microsoft, is one of several companies that brought the issue into the European Union.

European Union regulators levied an anti-competitive charge against Google in April 2015. More evidence was provided in July this year. The commission also issued a separate charge sheet against Google's advertising arm, AdSense for Search.

In a statement posted on the company's blog, Google general counsel Kent Walker said, "We never compromised the quality or relevance of the information we displayed. On the contrary, we improved it."

Walker added that the European Union failed to take into account the competition imposed by rival services like Amazon, social media sites, merchant platforms, and online advertising from companies like Facebook and Pinterest, according to CNBC.

European Commission spokesman Ricardo Cardoso said that they are studying Google's response to the cases filed. Cardoso said that while Google has a point in stating that the company's search service have helped consumers, the commission is focusing on the service's effects on its competitors which they deemed might have outweighed the Google's argument.

Google said that it is rejecting the European Union's proposal which will allow the search engine giant to levy charges to rivals for prominently displaying their services on the company's platform.

The European Union is planning to charge a hefty fine to Google if the commission finds the company guilty of breaking the rules. Google is reportedly facing penalty amounting up to $7.4 billion.