Answer:
Defamation.
Explanation:
eProducts could sue Data Analytics using defamation as legal ground. Defamation occurs when:
1) A party or an individual makes a false statement. (eProducts is scamming their customers).
2) This false statement then gets released publicly. (Data Analytics ad campaign)
3) This statement injures the reputation of the affected party. (eProducts is losing sales due to this issue).
Knowing these facts, we can surely conclude that eProducts is being a victim of defamation and could perfectly sue Data Analytics and take them to court for it.