Response:
The solution and calculations pertinent to this question are contained in the first, second, third, fourth, and fifth images.
Clarification:
Conclusion: Advertisement
Rationale: When they mention receiving consecutive awards, it essentially promotes the message "Purchase our vehicle; we consistently receive awards," which I view as a form of advertising.
The total unique names equal 8,200.
You start by emailing a list of 5000 names, then a second list of 3900 names, resulting in 8900 total. Subtracting the 700 duplicates common to both lists gives a final count of 8,200 unique names.