No, don't say it. We'll understand what you want to say, but the sentence is incorrect and weird.
"Service" is uncountable, so it's not possible to say "a service" here.
"Obtrusive" is a formal word. "Do not" is also a formal construction. However, you're talking about feelings, so it's far more natural to say "I don't like pushy salespeople." Leave the formality for academic discussions.